Article continues below advertisementJohn Stamos stripped down to a pair of underwear - and nothing else - in a steamy shower post.The actor gave fans an inside look at his bathing routine while ringing in his 62nd birthday on Tuesday, August 19.Stamos sizzled underneath an outdoor shower head, baring his six-pack stomach.Article continues below advertisementSource: @johnstamos/InstagramJohn Stamos bared his lean physique in the shower.His mouth was agape as he allowed the water to fall onto his shirtless body and black Calvin Klein boxers.