Julia Roberts insists marriage hasn't really changed George Clooney.

The Ocean's Eleven co-stars recently wrapped Money Monster, a dramatic thriller directed by Jodie Foster.

Roberts didn't hesitate one bit when I asked her last night at the premiere of Secret in Their Eyes if Clooney has "mellowed" since he and Amal Clooney tied the knot.

"No!' she said. "When you get married, you don't change. You just become the evolved fabulous person of who you are. That's what your person does—you just create the extreme wonderful insides."

Then Roberts flashed her signature smile. "That's really sappy."

George Clooney, Julia Roberts, Vanity Fair

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Clooney is legendary in Hollywood for pranking his co-stars. Roberts did say that the actor has been pulling off "better pranks" these days.

But she politely declined to say how he got her on Money Monster. "I can't," she laughed. "I will later. It's a really good one."

Roberts also filled us in on how she prepared for Secret in Their Eyes. She plays an FBI agent who discovers that the victim at a gruesome murder scene is her daughter.

I asked if she met with real moms of murdered children to gain greater insight.

"You're the only person who has asked me that question and I've only been asked 37,412 and a half questions," Roberts said. "That's a really good question, but I didn't, because I don't think I could have handled that, quite frankly. But I did listen to interviews like radio conversations and things about this unmentionable topic so I did feel like I had some tangible investment in the very particular grief and pain of that. I could hear what it sounded like in someone's voice...I almost forgot I did all that work until you asked me that question."

Secret in Their Eyes, which co-stars Nicole Kidman and Chiwetel Ejiofor, is in theaters Nov. 20.

For more from the premiere, tune into E! News tonight at 7 p.m. and 11 p.m.

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