Adele performed in front of a celebrity-filled audience at her show in LA last night (August 15).
he London singer performed to a sold-out crowd including Robert Pattinson and the cast of Glee, at Los Angeles' Greek Theatre, reports The Sun.
Christina Aguilera posted a picture of her and Adele on Twitter: "Me & Adele. Someone Like you is my favourite! Beautiful to see all her fans sing it tonight!;) Love u Adele."
Adele's '21' has been huge success state side, remaining at number one for the last twelve weeks.
Meanwhile, Adele's '21' has recently been nominated for this year's Mercury Prize award, along with the likes of Katy B, Elbow, Tinie Tempah, James Blake, PJ Harvey, Anna Calvi and Metronomy and others.