Ian Ziering -- I'm Ready to Be a Male Stripper!

Attention West Beverly High alumni: Steve Sanders is jacked.

Former "Beverly Hills, 90210" star Ian Ziering is getting pumped for his upcoming gig stripping with the yoked man panty crew of Chippendales ... by working out -- with a photographer on hand -- in Studio City on Thursday.

While the 49-year-old's shirtless Vegas stint doesn't start until June ... he's already showing off his peach pits.