An upcoming episode of Lip Sync Battle in the US will be featuring Eva Longoria and Hayden Panettiere, with the latter taking on Christina Aguilera and major hit Moulin Rouge single 'Lady Marmalade'.
What audience members didn't expect on the day is the lady herself - Aguilera - to step out and join Panettiere for the performance, a clip of which you can see above.
This comes after pop superstar Beyoncé joined Channing Tatum on the Lip Sync Battle stage as he performed to 'Run The World (Girls)'.
The show's executive producer Casey Patterson explained at the time: "That moment on air, that's the first time they ever met.
"He's dressed as her, dancing and singing to her song. We were just hoping he would keep dancing."
See the collaboration as Lip Sync Battle continues in the US this Thursday, 8pm ET on Spike.
Tagged in Christina Aguilera Hayden Panettiere