Grade: A
Rihanna made quite a statement in a custom-made red Alaia gown that despite its high neckline still had enough sheer paneling to let her flaunt her sexy side. The “Diamonds” singer said the showstopper was her first choice, explaining, “I like the A-line.”
Jennifer Lopez
Grade: C
Jennifer Lopez tried to skirt around this year's Grammy dress code by covering up on top and showing a whole lotta leg — take that, Angelina Jolie! — in her Anthony Vaccarello dress, which she paired with gold-accented heels, a cuff bracelet, and a slicked-back top knot. While it's not quite as racy as the infamous green Versace gown she wore at the 2000 Grammys, it's pretty close! Unfortunately, we can't help but think that at this point, she's trying a little too hard.
Beyoncé
Grade: B+
Even though this black-and-white Osman jumpsuit is sort of conservative for Beyoncé (and the Grammys!), we can't deny that she looks simply stunning. The 31-year-old singer accessorized with Lorraine Schwartz jewelry, a Swarovski clutch, and a sleek long ponytail.
- lkkkkRihanna
Grade: A
Rihanna made quite a statement in a custom-made red Alaia gown that despite its high neckline still had enough sheer paneling to let her flaunt her sexy side. The “Diamonds” singer said the showstopper was her first choice, explaining, “I like the A-line.” - Jennifer Lopez
Grade: C
Jennifer Lopez tried to skirt around this year's Grammy dress code by covering up on top and showing a whole lotta leg — take that, Angelina Jolie! — in her Anthony Vaccarello dress, which she paired with gold-accented heels, a cuff bracelet, and a slicked-back top knot. While it's not quite as racy as the infamous green Versace gown she wore at the 2000 Grammys, it's pretty close! Unfortunately, we can't help but think that at this point, she's trying a little too hard.less - Beyoncé
Grade: B+
Even though this black-and-white Osman jumpsuit is sort of conservative for Beyoncé (and the Grammys!), we can't deny that she looks simply stunning. The 31-year-old singer accessorized with Lorraine Schwartz jewelry, a Swarovski clutch, and a sleek long ponytail. - Taylor Swift
Grade: A
Multiple-nominee Taylor Swift was a goddess in a Grecian gown by J. Mendel featuring silver accents, which she perfectly complemented with an elegant braided updo. Do you think she was the best dressed star of the night? - Katy Perry
Grade: F
Katy Perry apparently didn’t get the Grammy dress code memo … because the Best Pop Solo-nominated singer let it all hang out in a mint green Gucci creation with a keyhole cut-out that revealed just way too much cleavage – even if it was nicely framed with gold-and-teal embellishments. Perry, who did not hit the red carpet with boyfriend John Mayer, revealed that her ‘60s style ensemble (including her big hair) was inspired by Priscilla Presley.less - John Mayer
Grade: D
John Mayer seemed to be doing a dress rehearsal for next Halloween, when he'll go as Willy Wonka, in his Brioni blue velvet jacket and matching bow tie. All he's missing is the top hat! We're sure Mayer's gal pal Katy Perry, who's been known to wear some wacky looks herself, gave it a thumbs up. - Carrie Underwood
Grade: A-
Sticking with the trendy designer of the evening, Roberto Cavalli, Carrie Underwood's elegant black strapless gown was demure, but her 381-carat diamond necklace certainly wasn't! - Justin Timberlake
Grade: B
A clean-shaven JT hit the red carpet in a shiny Tom Ford suit, floppy bow tie, and a snazzy pair of white-and-black shoes. Do you think he looks dapper, or a little like a penguin? - Adele
Grade: D
Sorry, but Adele didn't exactly rock the red carpet in this frumpy floral-printed frock by Giorgio Armani, which she paired with matching heels. - Chris Brown
Grade: C+
Chris Brown may have worn all white to the Grammys, but how pure is he? A day after he crashed his Porsche while running from the paparazzi (or so he claims), the “Don’t Wake Me Up” singer, nominated for Best Urban Contemporary Album, hit the red carpet in a Lanvin suit with pops of black in his jacket buttons and belt … but no Rihanna. - Florence Welch
Grade: A
Florence + the Machine songstress Florence Welch shined bright like an emerald … in head-to-toe Givenchy. The French designer custom made the studded green gown, shoes, and clutch for the “Sweet Nothing” singer, although he did take her input when it came to the sequins. “For me with my hair color, green is a good color,” said the redheaded Welch, who has worn Givenchy to every Grammy Awards she has attended.less - Carly Rae Jepsen
Grade: B+
Canadian songstress Carly Rae Jepsen looked like a lovely mermaid in her shimmering Roberto Cavalli creation. "I tried on like eight different ones before I knew," she told Ryan Seacrest on the red carpet. Her signature heavy bangs and some blue eye shadow completed her look. - Deadmau5 and Kat Von D
Grade: C
Lovebirds Deadmau5 and Kat Von D kept it casual. While the electronic musician stayed true to his style sporting a white T-shirt, black leather jacket, mismatched kicks, and a hat that said “Your S**t Bums Me Out,” the tattoo artist proudly showed off her inked legs in a red-and-black patterned Derek Lam frock and matching red platforms. - Alicia Keys
Grade: B-
The "Girl Is On Fire" songstress wore a black dress featuring a leather bodice with cutouts, dangling earrings, and an elegant updo. While we're not huge fans of the finished product, Keys earns kudos for keeping things interesting, rather than opting for a more plain style. - Wiz Khalifa and Amber Rose
Grade: B+
Expectant parents Wiz Khalifa and Amber Rose (she’s due to give birth in three weeks!) got all gussied up for the Grammys. While the rapper opted for a black-and-white Tom Ford ensemble, Amber showed off her baby bump in a black Donna Karan design. - Kelly Rowland
Grade: B+
Beyonce who? Kelly Rowland, fresh off her Super Bowl performance with her former Destiny’s Child members, rocked a Georges Chakra Couture mermaid-style gown with geometric mesh panels … in all the right places.
- Rihanna
Grade: A
Rihanna made quite a statement in a custom-made red Alaia gown that despite its high neckline still had enough sheer paneling to let her flaunt her sexy side. The “Diamonds” singer said the showstopper was her first choice, explaining, “I like the A-line.” - Jennifer Lopez
Grade: C
Jennifer Lopez tried to skirt around this year's Grammy dress code by covering up on top and showing a whole lotta leg — take that, Angelina Jolie! — in her Anthony Vaccarello dress, which she paired with gold-accented heels, a cuff bracelet, and a slicked-back top knot. While it's not quite as racy as the infamous green Versace gown she wore at the 2000 Grammys, it's pretty close! Unfortunately, we can't help but think that at this point, she's trying a little too hard.less - Beyoncé
Grade: B+
Even though this black-and-white Osman jumpsuit is sort of conservative for Beyoncé (and the Grammys!), we can't deny that she looks simply stunning. The 31-year-old singer accessorized with Lorraine Schwartz jewelry, a Swarovski clutch, and a sleek long ponytail. - Taylor Swift
Grade: A
Multiple-nominee Taylor Swift was a goddess in a Grecian gown by J. Mendel featuring silver accents, which she perfectly complemented with an elegant braided updo. Do you think she was the best dressed star of the night? - Katy Perry
Grade: F
Katy Perry apparently didn’t get the Grammy dress code memo … because the Best Pop Solo-nominated singer let it all hang out in a mint green Gucci creation with a keyhole cut-out that revealed just way too much cleavage – even if it was nicely framed with gold-and-teal embellishments. Perry, who did not hit the red carpet with boyfriend John Mayer, revealed that her ‘60s style ensemble (including her big hair) was inspired by Priscilla Presley.less - John Mayer
Grade: D
John Mayer seemed to be doing a dress rehearsal for next Halloween, when he'll go as Willy Wonka, in his Brioni blue velvet jacket and matching bow tie. All he's missing is the top hat! We're sure Mayer's gal pal Katy Perry, who's been known to wear some wacky looks herself, gave it a thumbs up. - Carrie Underwood
Grade: A-
Sticking with the trendy designer of the evening, Roberto Cavalli, Carrie Underwood's elegant black strapless gown was demure, but her 381-carat diamond necklace certainly wasn't! - Justin Timberlake
Grade: B
A clean-shaven JT hit the red carpet in a shiny Tom Ford suit, floppy bow tie, and a snazzy pair of white-and-black shoes. Do you think he looks dapper, or a little like a penguin? - Adele
Grade: D
Sorry, but Adele didn't exactly rock the red carpet in this frumpy floral-printed frock by Giorgio Armani, which she paired with matching heels. - Chris Brown
Grade: C+
Chris Brown may have worn all white to the Grammys, but how pure is he? A day after he crashed his Porsche while running from the paparazzi (or so he claims), the “Don’t Wake Me Up” singer, nominated for Best Urban Contemporary Album, hit the red carpet in a Lanvin suit with pops of black in his jacket buttons and belt … but no Rihanna. - Florence Welch
Grade: A
Florence + the Machine songstress Florence Welch shined bright like an emerald … in head-to-toe Givenchy. The French designer custom made the studded green gown, shoes, and clutch for the “Sweet Nothing” singer, although he did take her input when it came to the sequins. “For me with my hair color, green is a good color,” said the redheaded Welch, who has worn Givenchy to every Grammy Awards she has attended.less - Carly Rae Jepsen
Grade: B+
Canadian songstress Carly Rae Jepsen looked like a lovely mermaid in her shimmering Roberto Cavalli creation. "I tried on like eight different ones before I knew," she told Ryan Seacrest on the red carpet. Her signature heavy bangs and some blue eye shadow completed her look. - Deadmau5 and Kat Von D
Grade: C
Lovebirds Deadmau5 and Kat Von D kept it casual. While the electronic musician stayed true to his style sporting a white T-shirt, black leather jacket, mismatched kicks, and a hat that said “Your S**t Bums Me Out,” the tattoo artist proudly showed off her inked legs in a red-and-black patterned Derek Lam frock and matching red platforms. - Alicia Keys
Grade: B-
The "Girl Is On Fire" songstress wore a black dress featuring a leather bodice with cutouts, dangling earrings, and an elegant updo. While we're not huge fans of the finished product, Keys earns kudos for keeping things interesting, rather than opting for a more plain style. - Wiz Khalifa and Amber Rose
Grade: B+
Expectant parents Wiz Khalifa and Amber Rose (she’s due to give birth in three weeks!) got all gussied up for the Grammys. While the rapper opted for a black-and-white Tom Ford ensemble, Amber showed off her baby bump in a black Donna Karan design. - Kelly Rowland
Grade: B+
Beyonce who? Kelly Rowland, fresh off her Super Bowl performance with her former Destiny’s Child members, rocked a Georges Chakra Couture mermaid-style gown with geometric mesh panels … in all the right places.