John Stamos reunited with the Beach Boys at the LA County Fair. Stamos sang with the band in his first appearance with them since his post DUI rehab stint earlier this summer.

The Beach Boys welcomed him back as images of him as Uncle Jesse from Full House flashed on the big screens. He then wowed the crowd with a drum solo.

He also played bongos, and guitar, as well as adding vocals to "Kokomo" and "Why Do Fools Fall in Love."

Stamos' upcoming projects include "My Big Fat Greek Wedding 2" and the TV series "Grandfathered."

Stamos checked into a "residential program for the treatment of substance abuse" in late June, a couple weeks after being arrested for DUI in Beverly Hills.