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Jennifer Aniston is getting frisky on the red carpet!

At last night's Horrible Bosses 2 premiere in Hollywood, Aniston crashed E! News' interview with co-star Jason Sudeikis.

During our chat, we asked the funnyman what's the best part about being a father to his and Olivia Wilde's baby boy, Otis. "Just him—the baby," Sudeikis gushed. "I mean all the clichés are true."

As for new milestones, Sudeikis joked, "Well I FaceTimed with him today and he tried to eat the phone."

Jason Sudeikis, Jennifer Aniston

Dave J Hogan/Getty Images

That's when Aniston walked by, grabbed Sudeikis' butt and crashed out interview! "Do you have like metal underwear on?" Aniston asked Sudeikis.

"Yeah, chainmail," he cracked. "I pinched his butt and then I was like..." Aniston said while making a surprised face and grabbing his butt again on camera.

So does Sudeikis really have buns of steel? "I wish," he laughed. "More like buns of like Beanie Babies."

And Aniston's butt pinching left Sudeikis a little starstruck. "I wouldn't say that's normal at all," he told E! News. "I'm playing it cool, but it's not normal. I'm trying to look cool. I'm going to freak out about that when I have some alone time."

LOL! Watch the funny video of Aniston and Sudeikis for yourself!