Christina has aged better because she doesn't smoke. She also hasn't had to carry two world tours, promote two number one albums.
I vote Brit though. Christina's chins cost her some serious points.
Britney Spears | Adele | John Mayer | Mary J. Blige | Rebecca Ferguson | Rihanna Leona Lewis | Patrick Wolf | Florence + The Machine | Alicia Keys | Kanye West
Coldplay | Janet Jackson | Grace Jones | Chase & Status | Amy Winehouse Twitter
Christina has always had her ups and downs make up/outfit wise. But she's been giving us some of her best looks this past year
Björk | Christina Aguilera | Mariah Carey | Enya
Cher | Kate Bush | Sia | Barbra Streisand | Lana Del Rey | Lady Gaga | Alanis Morissette | Marina and The Diamonds | M.I.A. | Tori Amos| Florence & The Machine | Ellie Goulding | Sinéad O'Connor | Erykah Badu | Natalia Kills |