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A Big Bang Theory star has surprise makeout sesh on Lip Sync Battle (VIDEO)

A celebrity gossip junky, Caroline Goddard has been writing entertainment news for longer than the world has known Kim Kardashian's name. Follow her on Twitter at @GoddardCaroline.

Josh Gad manages to shock Kaley Cuoco with one perfect kiss

Lip Sync Battle got super hot this week as two stars got unexpectedly hot and heavy — OK, maybe it was less "hot" and more "hilarious"!

The Comedians star Josh Gad put on his best Donald Trump impression in a political spin on The Divinyls hit "I Touch Myself," even stripping down to skivvies made of cold, hard cash — but it was a surprise appearance by a Big Bang Theory star that stole the show!

More: Derek Hough is mortified during Julianne Hough's vulgar lip sync battle (VIDEO) 

Yup, that would be Johnny Galecki he's making out with, dressed as a mariachi singer. On a horse.

Making this even more hilarious is that Gad's opponent in the competition was Kaley Cuoco, Galecki's Big Bang Theory costar and rumored girlfriend!

More: Anna Kendrick in Lip Sync Battle is everything (VIDEO)

Cuoco denies the former flames are dating again after her divorce from Ryan Sweeting, but they were all over each other at the People's Choice Awards. Public speculation after the show aired led Cuoco to caption Instagram pics of the two "#mydate" "#notdating."

We haven't seen any clips of Cuoco's performance, but you can see who wins — and if she has anything up her sleeve that could possibly top Gad and Galecki's crazy kiss — on Lip Sync Battle Thursday on Spike TV.

More: Kaley Cuoco and Johnny Galecki's new pic gives fans the wrong idea (PHOTO)

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