The two do lock lips during Glee's upcoming 100th episode.
"A tiny bit," Agron teased at last night's Bulgari Decades of Glamour party at Soho House in L.A. "Just baby kisses."
Things didn't even get a wee bit steamier? "No, it's TV," she said. "We're not HBO or Showtime."
The former Gossip Girl will make his Glee debut with the episode. As we were the first to tell you last month, Crawford is playing a bad boy from Yale named Biff. "He's just a snob—a snob and a half," Agron cracked.
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While there may be some kissing, Crawford doesn't join in on the singing. "He's not singing," Agron said. "Although I'm sure he can…He said that he can't, but I think he can. I've heard him play around a little bit."
She also gushed, "It was so much fun to work with him. I've known him about seven years or something like that."
Funny enough, she worked with another Gossip Girl pal, Ed Westwick, just before shooting Glee's 100th. "It's odd that I never worked with either of them," Agron said. "I worked with Ed Westwick in this movie Conspiracy and then Chace right after, so I got a dose of those boys."
Lea Michele told E! News earlier this week that she and Agron do perform together in the episode. "Dianna and I got to do this amazing number," she smiled. "All I'll say is we were at a club, there was foam, Gwyneth Paltrow was there and we were dressed up in '70s disco outfits, so that definitely made up for all of our time unspent."
Glee's 100th episode airs in two parts on Fox March 18 and March 25.
Check out more from the Bulgari party on E! News tonight at 7 p.m. and 11:30 pm.