ZZ Top -- Charlie Sheen's Fantasy

4/1/2010 9:00 AM PDT
Charlie Sheen was stoked Wednesday afternoon when he shared his "Two and a Half Men" stage with ZZ Top.

We got this pic from Wednesday's rehearsal. The show tapes today in front of a live audience.

We're told Mr. Top will play himself in a "fantasy sequence." So if you ever wanted to see Charlie's fantasy ...