Christina Aguilera crashes Hayden Panettiere's "Lip Sync Battle"

Christina Aguilera arrives at NBC's "The Voice" Season 8 red carpet event at Pacific Design Center on April 23, 2015, in West Hollywood, California.

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First it was Beyonce, and now Christina Aguilera is the latest diva to crash the stage at "Lip Sync Battle."

Actress Hayden Panettiere guest-starred on the show and performed the 2001 hit "Lady Marmalade." Panettiere mimicked Aguilera's throwback look from the music video, complete with a huge blonde wig and a corset and gloves.

But the real surprise came when Aguilera joined Panettiere on stage to perform a few lines from the song. Unlike Panettiere, though, Aguilera is not lip syncing -- and the diva definitely still has her pipes.

Watch the teaser below.

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