Will Ferrell and John C. Reilly Working on A 'Step Brothers' Rap Album?After teasing us over the years with glimpses of his vocal talents, Will Ferrell is finally recording an album, and he's bringing his rhymes with him. According to a tweet from 'Step Brothers' director Adam McKay, Ferrell and John C. Reilly are currently working on a rap album inspired by 'Step Brothers' (2008) with the help of a mysterious "big-time producer."

"I wasn't kidding about Step Bros rap album. And we just found out we have a crazy big time producer. Mos Def, you up for a guest flow?" McKay tweeted.

Reilly and Ferrell have performed a duet together before. The pair reenacted David Bowie and Bing Crosby's 'Little Drummer Boy' in December. Although we can't fist pump the epic rap album yet, we can still look back on the best moments from Ferrell's pipes.

See Will Ferrell's best musical moments after the jump!