Credit: via John Stamos's Twitter Photo: Sneak Peek Pic of Dr. Carl and Puck in a Band in Glee Season 2, Episode 15: "Sexy"

We had our first hint of what’s to come in Season 2, Episode 15: “Sexy,”  on Friday — but now Uncle Jesse (Dr. Carl) has offered us a brand new tidbit with this sneak peek pic! Accompanying the photo was the following tweet: “either me and @Mark_Salling lost a bet (outfits) or it's the FIRST look pic from "sexy" GLEE ep. airing march 8th."

What do you think, Gleeks? If you had to place bets, which song do you think the jazz ensemble will sing?