When Kathie Lee's away, fun co-hosts get to come join Today's wacky 4th hour. This morning, Jimmy Fallon co-hosted and randomly broke out into interpretive dance (channeling West Side Story, we think) to Akon's "Who Dat Girl."

[There was a video here]

He also spoke about what it feels like to be on the cover of Rolling Stone this month.

[There was a video here]