Christina Aguilera Joins Hayden Panettiere for Epic 'Lady Marmalade' Lip Sync Battle - Watch Now!

Christina Aguilera makes an epic appearance alongside Hayden Panettiere while serving as a special guest performer on Lip Sync Battle, which aired on Thursday (February 11).

The 35-year-old singer surprised the crowd while joining Hayden, 26, in a performance of “Lady Marmalade” on the hit Spike series.

PHOTOS: Check out the latest pics of Christina Aguilera

There is a history between the two ladies as Christina once guest-starred on Hayden‘s ABC show Nashville during season three.

Hayden was battling Eva Longoria, who performed “Anaconda” for the second round. Watch the full clip below!