AceShowbiz -

Gwyneth Paltrow is back on "Glee", so is John Stamos. When free-spirited substitute teacher Holly Holiday fills in for the absent sex-education teacher, she joins forces with Mr. Schuester to teach the kids of New Directions the facts of life. Meanwhile, Emma heads up the Celibacy Club, and she and Dr. Carl address some issues in their personal life.

"Sexy" is the title of the March 8 episode, referring to the sexy sex ed substitute. Matthew Morrison previously dished out that his character Will sings a duet with Holly on Prince's "Kiss" while doing a steamy tango which ends up with, surprise surprise, a kiss.

"I'll keep that to myself," Morrison said about kissing Paltrow. "Seriously, she's become such a good buddy of mine. I have the biggest place in my heart for this woman. So it's kind of weird now because I'm making out with my buddy!"

Meanwhile, Stamos' return would be marked with a duet with Mark Salling's Puck. "Either me and @Mark_Salling lost a bet (outfits) or it's the FIRST look pic from 'sexy' GLEE ep. airing march 8th," Stamos tweeted and posted a scene where he plays the drums. The actor has frequently guest-drummed for The Beach Boys.