'Full House' Reunion: Why Is John Stamos In His Underwear?

John Stamos kept morning TV all kinds of sexy on Thursday when he stripped down to his boxers.

The 50-year-old actor, who has reunited with “Full House” co-stars Dave Couiler and Bob Saget to promote their new Super Bowl commercial, appeared on “Good Morning America” to promote their spot and Stamos managed to work in a mention of Dannon Oikos yogurt, a product for which he’s a pitchman.

He claimed he was wearing boxers plastered with yogurt cups – and he proved it by dropping his pants on live TV!

PHOTOS: Stars In Their Underwear

The Uncle Jesse, Joey Gladstone and Danny Tanner reunion started on Wednesday night with an appearance “Late Night with Jimmy Fallon,” where they coached the future “Tonight Show” host on his transition to his new gig.

The “Full House” trio will continue their media blitz on Thursday’s “Watch What Happens Live” on Bravo.

-- Jesse Spero

Copyright 2014 by NBC Universal, Inc. All rights reserved.
This material may not be published, broadcast, rewritten or redistributed.