Pentatonix's Cover of Xtina's "Say Something" Will Give You Chills
America's most famous a cappella group reimagine Xtina and A Great Big World's hit ballad with a cello, beatboxing and gorgeous harmonies
Christina Aguilera Pregnant With Baby No. 2!
The newly-engaged pop star and her fiance are reportedly expecting their first child
Lady Gaga & Christina Aguilera Reveal New Lyrics in "Do What U Want" Remix
The blonde singers detail the pains of pop superstardom
Happy Birthday, Christina Aguilera! The Essential Xtina Playlist
Celebrate the pop diva's 33rd birthday with a massive 65-song playlist featuring her biggest hits, smash collaborations and deep album cuts
Happy Birthday, Xtina! Our 10 Fave Christina Performances
Celebrate one of pop music's biggest voices on her 33rd birthday by reliving some of her most memorable (and lesser known) live moments
Gaga & Xtina Toast New Friendship on Killer Live "Do What U Want" Duet
Putting rumors of a feud to bed, Christina Aguilera took over R. Kelly's part on Lady Gaga's 'ARTPOP' duet and absolutely brought the house down on 'The Voice'
Watch A Great Big World & Xtina's Tear-Jerking "Say Something" Video
You might need a tissue for this one
A Great Big World on Nabbing Christina Aguilera for "Say Something"
The rising indie pop stars also talk about performing with Xtina on 'The Voice' and writing music to connect with fans
Everything We Know About 'The Hunger Games: Catching Fire' Soundtrack
Coldplay, Christina Aguilera, The Weeknd, Patti Smith and more have all recorded new songs for the much-anticipated second installment of the sci-fi adventure series