Hayden Panettiere [1] went head to head with Eva Longoria [2] on Lip Sync Battle [3], and both actresses knew they had to pull out all the stops. Eva went first, covering Nicki Minaj's "Anaconda" — complete with a prosthetic butt. Hayden retaliated with a performance of "Lady Marmalade," lip-syncing in an exact replica of Christina Aguilera [4]'s iconic costume from the song's music video, and to top it all off, she brought out the queen of celebrity impersonations [5] herself. Hayden and Christina's performance was so good, but it wasn't enough to take down Eva. Check it out above, and see what happened when Nina Dobrev took on Tim Tebow last week [6]!