Caught in the Act

Adam Sandler Films Daughter's Karaoke Performance

10/25/2012 at 06:00 AM EDT

Adam Sandler stopped into the Giggles N' Hugs Century City, Calif., location with his daughter, Sadie, and wife, Jackie, on Sunday.

"Adam came in about 45 minutes before closing with his daughter," an onlooker tells PEOPLE.

Wearing a green T-shirt and baseball cap, Sandler was a proud papa as Sadie performed for the That's My Boy actor.

"Sadie sang a song for kids karaoke and Adam filmed it on his cell phone," the source adds.
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