Leslie Mann: I Couldn’t Resist Grabbing Kate Upton’s Butt!

Leslie Mann has gone somewhere some folks can only dream about – to Kate Upton’s backside!

The actress revealed that while filming “The Other Woman” with Kate she couldn’t help herself when it came to the Sports Illustrated model’s cover-worthy tush.

“She turned 21 while we were working last summer and she’s like a little girl and… at the time I had a 15-year-old and so she’s only five years older than my daughter and she acts like a little girl, she looks like a woman, but she acts like a little girl,” she told Billy Bush and Kit Hoover, complimenting the actress’ youthful vibe, on Access Hollywood Live from CinemaCon in Las Vegas on Friday.

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And when Leslie found herself in close proximity of Kate’s rear, she couldn’t help herself.

“One day she was walking ahead of me, up a flight of stairs and I was walking behind her and she had these little short shorts on and I was just I looked at her butt and… I just grabbed her butt!” she revealed.

Kate was a little taken aback by Leslie’s backside action.

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“She turned around and looked at me like, ‘What the hell, you weirdo pervert?’ But yeah, she’s like a little girl, but she looks like a woman,” the actress said of her co-star.

Besides her natural physical talents, Leslie was impressed with Kate’s acting skills.

“Kate is a really good actress. She’s surprisingly good at improvising, I don’t know where that comes from, but she was great and we love each other,” she said.

“The Other Woman,” also starring Cameron Diaz and Taylor Kinney, opens on April 25.

— Jesse Spero

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