Kelly Clarkson guest stars the Robin Williams, Sarah Michelle Gellar-starring CBS show The Crazy Ones and makes quite the stir.

Gellar and Williams co-star as father-daughter advertising team and watch on as Clarkson performs a sexualized song in the studio with James Wolk.

While Williams loves the direction the song is going, Gellar gets flustered and doesn’t exactly seem on board with it. As Clarkson is singing the “sex song,” as one of their colleagues puts it, Gellar’s character panics.

“Oh my god. I'm about to watch America's sweetheart orgasm in front of my father!" she says, Perez Hilton notes.

Williams has previously opened up about appearing on the small screen again, saying, “It's great to have a steady gig again after so long. It's wonderful.”

The series is executive produced by Ally McBeal’s David E. Kelley, who said of Williams, “When we were talking about casting, someone said Robin Williams. And we said, yeah, right. But we made the call and he was interested.”

image: NBC