During this year's Revolver Golden Gods Awards show, Joan Jett got up to play "I Hate Myself For Loving You", and Taylor Momsen of The Pretty Reckless joined her for the song.

While that was a pretty cool thing to see as they were playing, it got better.

ZZ Top mainman Billy Gibbons crept out on stage and proceeded to touch both women, while urging the crowd to sing along.

"Joan Jett's the coolest chick ever, so it was a blast playing with her, and we got a surprise guest with Billy Gibbons and he touched my butt. He was just lookin' for some tush."
via Blabbermouth

I guess he found some.  Nice work, Mr. Gibbons.