OnlyOnAOL: Get ready for a whole new side of Shay Mitchell

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Shay Mitchell On "Mother's Day"

By: Donna Freydkin

Get ready to see more of Shay Mitchell.

The star of "Pretty Little Liars" plays the stepmom of two boys in "Mother's Day," opening Friday. And she's co-parenting with none other than Jennifer Aniston. Meeting the superstar was, well, eye-opening.

"I was very nervous. I'd be lying if I said I wasn't. She was very sweet. She introduced herself. She came up and said, 'Hi, I'm Jen,'" says Mitchell.

In the film, there are intertwining stories revolving around a TV host (Julia Roberts), two sisters (Kate Hudson and Sarah Chalke) and their ultra-conservative parents and a divorced mom (Aniston) looking for love. The film is directed by rom-com master Garry Marshall.

AOL Build Presents: "Mother's Day""Getting to work with Garry Marshall is just a pleasure," says Mitchell. "He walked into the room and asked, 'Where's my beautiful girl?' And his wife was right behind me."

In fact, it's only thanks to Marshall that you see Mitchell in a bathing suit.

"If I don't have a month warning that you're going to be in a bikini, I wouldn't have done it. But he came over as I was eating hot Cheetos," she says, and asked her to take her coverup off. "You don't say no to Garry Marshall. I took it off, Cheetos and belly and all that. It was fine."

AOL Build Speaker Series - Shay Mitchell, "Mother's Day"Indeed, Mitchell is a knockout in real life, in every sense of the word.

"I feel sexiest after a workout. I'm talking boxing. Every single day, I go into the boxing (ring). It's full-on. It's very therapeutic," says Mitchell. "I leave feeling stronger."

While she doesn't have kids in real life, Mitchell can relate to her character, who boasts enviable dessert skills.

'Tina is very genuine. She does have a genuine love for her husband and her stepkids. She's ready to take on this role. She did her best. Overnight you're now a mom and a wife. I think I would be kind of similar, maybe. I don't think I'd bake those cookies as perfectly as she did, maybe," says Mitchell.

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Shay Mitchell (updated 7/31/2014)
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OnlyOnAOL: Get ready for a whole new side of Shay Mitchell
NEW YORK, NY - MARCH 18: Actress Shay Mitchell attends the 'Pretty Little Liars' season finale screening at the Ziegfeld Theater on March 18, 2014 in New York City. (Photo by Mike Pont/FilmMagic)
NEW YORK, NY - MARCH 18: Actress Shay Mitchell attends the 'Pretty Little Liars' season finale screening at the Ziegfeld Theater on March 18, 2014 in New York City. (Photo by Mike Pont/FilmMagic)
HOLLYWOOD, CA - MAY 31: Shay Mitchell attends the 'Pretty Little Liars' Celebrates 100 Episodes held at the W Hollywood Hotel on May 31, 2014 in Hollywood, California. (Photo by JB Lacroix/WireImage)
HOLLYWOOD, CA - MAY 31: Shay Mitchell attends the 'Pretty Little Liars' Celebrates 100 Episodes held at the W Hollywood Hotel on May 31, 2014 in Hollywood, California. (Photo by JB Lacroix/WireImage)
LOS ANGELES, CA - MARCH 24: Actress Shay Mitchell arrives at the LA celebrity MS Walk kick-off event at SupperClub Los Angeles on March 24, 2014 in Los Angeles, California. (Photo by Chelsea Lauren/WireImage)
Shay Mitchell at PALEYFEST 2014 - "Pretty Little Liars" on Sunday, March 16, 2014, in Los Angeles. (Photo by Richard Shotwell/Invision/AP)
Shay Mitchell attends CNN Heroes: An All-Star Tribute on Tuesday, Nov.19, 2013 in New York. (Photo by Charles Sykes/Invision/AP)
Shay Mitchell attends CNN Heroes: An All-Star Tribute on Tuesday, Nov.19, 2013 in New York. (Photo by Charles Sykes/Invision/AP)
Shay Mitchell arrives at the Teen Choice Awards at the Gibson Amphitheater on Sunday, Aug. 11, 2013, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)
Shay Mitchell attends the "Pretty Little Liars" season finale screening on Tuesday, March 18, 2014 in New York. (Photo by Charles Sykes/Invision/AP)
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