Cast your mind back to 2001.
Apart from some very suspect eyeshadow shades, what else do you remember sharing among girlfriends?
If you were anything like Team ELLE, you'll remember belting out all the lyrics to Lady Marmalade in each other's faces, taking it in turns to attempt Lil' Kim's rap or Christina Aguilera's vocal acrobatics.
Hayden Panettiere got to live out all of our teenage fantasies last night when she hit the stage for the ultimate Lady Marmalade lip sync performance.
The 'Nashville' and 'Heroes' actress dressed in full X-Tina get up, complete with rouge eye make-up and curly mega-wig.
The big surprise, as it often is with these lip sync battles, was that half way through her body-rolling, she was joined on stage by none other than Christina Aguilera herself.
Hayden, welcoming Christina to the stage, made room for the singer to wow everyone with a live rendition of the incredible sound we all remember from the original track.
With Beyonce and Channing Tatum in such recent memory, these lip sync battles are all A-Game at the moment - we wonder who they'll surprise us with next.