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Amy Schumer, Trainwreck

Universal Pictures

Amy Schumer is destined to be this summer's Most Wanted Funny Lady.

Because her movie Trainweck is going to be massive.

Schumer stars in the sometimes-raunchy comedy (in theaters on July 17) as a woman who sleeps around a lot because she doesn't believe in monogamy.

Wrestling star John Cena plays one of the guys she sees on a regular basis.

To say Schumer and Cena's sex scene is eye-popping hilarious is an understatement—especially when we get a peek at the Total Divas star's naked (and very tan!) butt.

"He's huge," Schumer told me the day after Trainwreck had its world premiere at South by Southwest. "People just gasped."

Vanessa Bayer, Bill Hader, Amy Schumer, Judd Apatow, SXSW

Michael Buckner/Getty Images for SXSW

Their romp in bed includes Cena attempting to talk dirty to Schumer. Much of it was ad-libbed. "He's truly the funniest person…The challenge of that scene was just not laughing," Schumer said.

Especially when the post-sex cleanup includes a shot of a naked Cena with just a hand towel covering and hanging from his seemingly erect you-know-what.

We're sad to report it was a dummy penis.

"I think it was part of a broomstick," Schumer said. "Jimmy was our prop guy and he was whittling one day. I was like, 'What you doing, Jimmy? What you working on?' He was like, 'I'm making John's erection.'"

Amy Schumer, Trainwreck

Universal Pictures

Directed by Judd Apatow and written by Schumer, Bill Hader co-stars in the film as the man Schumer finally falls for in a serious way. Rounding out the cast are LeBron James (as himself), Brie Larson, Colin Quinn, Vanessa Bayer and Tilda Swinton.

It was announced just this morning that Schumer will receive the CinemaCon Breakthrough Performer of the Year Award next month at CinemaCon, the annual movie theater owners convention in Las Vegas.

"It's super surreal," Schumer said when I asked her how she feels about the fame that comes along with success. "I mean, it's still surreal to me that I have a TV show and I have billboards of me or I do big casinos on the road. I don't think anyone can feel at peace with that. It's so strange."

And it's just going to get stranger.

(E! Online and Universal Pictures are both part of the NBCUniversal family.)