John Stamos To Join Beach Boys Reunion Tour?

Seems he was celebrating last night ... 'cause a boozy Stamos (but not boozy in a bad way) was hangin' at the Comedy Store on Sunset Blvd. when he revealed, "[The Beach Boys] asked me to be a part of the show ... I feel very honored."

The former "Full House" star performed with the band on a pretty regular basis during the '90s ... and participated in a few gigs in the past couple of years.

The band is reportedly set to kick things off at the Grammys next month ... followed by a 50-date tour.