Steven Tyler is a certified stripper.
The Aerosmith frontman celebrated after deciding who was in the Top 24 on "American Idol" last night -- by taking off his clothes and jumping into the water surrounding their chairs on the "Le Reve" stage in Las Vegas.
Tyler stripped down to his trunks -- shocking fellow judges Randy Jackson and Jennifer Lopez -- and mooned the camera. Thankfully, it was censored.
Well, now we know the answer to the question "Boxers ... or briefs?"
Check out the clip above!