Adam Sandler Films Daughter's Karaoke Performance
10/25/2012 AT 06:00 AM EDT
"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.
– Melody Chiu