Kaley Cuoco recently gave a surprising performance to Ludacris on "Lip Sync Battle."
A preview for Thursday's episode sees the 30-year-old actress give an energetic rendition of the 38-year-old rapper's hit "Move [Expletive]," impressing judge Chrissy Teigen.
Cuoco will compete against "Frozen" voice actor Josh Gad, who performed to Divinyls song "I Touch Myself." Gad dressed as Donald Trump and made out with the actress' Big Bang Theory co-star Johnny Galecki for the performance.
Cuoco and Galecki, who play Penny and Leonard on "The Big Bang Theory," dated in secret for two years.
The pair re-sparked speculation at the People's Choice Awards this month, but claimed they're "not dating" despite several cozy photos.
"Lip Sync Battle" premiered in April, and is inspired by Jimmy Fallon's popular "Tonight Show" segment of the same name.
Teigen and LL Cool J co-host the Spike TV series, which was renewed for a third season last week.
"The Big Bang Theory" is in its ninth season and airs Thursdays at 8 p.m. ET on CBS. Gad is known for voicing Olaf in the animated Disney movie "Frozen," and will portray Le Fou in the studio's live-action version of "Beauty and the Beast."