Leah Remini recalls slapping her friend Jennifer Lopez onscreen

When you've known someone for a long time, it's easy to fall into old habits -- even when those old habits involve a little roughhousing.  

Leah Remini sat down on Ellen to talk about her new movie, Second Act, with Jennifer Lopez, where the real-life longtime pals play besties onscreen.

"Sometimes working with friends is not always easy. And sometimes when you have chemistry, like with your significant other, it doesn't mean you will have chemistry onscreen," Remini explained. "So I was really, really happy when we did our first day of shooting and it was just very easy, it felt like Leah and Jennifer."

In the movie, Lopez plays Maya, an ambitious employee at a big-box store who's frustrated that she can't move up in the company without a college degree, and Remini plays her encouraging best friend, just like in real life. 

"I just said, I'm going to do some stuff to Jennifer that I do in real life to her," the 48-year-old said of their scenes together. "Like I do that who's the champ thing to her. Before the AMAs, I'm like, who's the champ? And she's like, I'm the champ."

But Remini admits she doesn't really need to pump up her pal's ego.

"I do it anyway even though she doesn't like it," she added.

Then Remini started to add in the slap -- but Lopez held her own and ended up making her laugh!

"And then I started to slap her, and she cracked me right across the face at the end, and you'll see as she's walking away, I start to smile. I started to smile right there because I fell to the ground in laughter and ruined the tape because she cracked me so hard," Remini said with a laugh.

Remini added, "I did that a lot in the movie, I ruined a lot of tapes."

Second Act arrives in theaters on Nov 21.

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NEW YORK, NY - AUGUST 07: Actress Leah Remini enters the 'The Late Show With Stephen Colbert' taping at the Ed Sullivan Theater on August 07, 2017 in New York City. (Photo by Ray Tamarra/GC Images)
NEW YORK, NY - APRIL 05: Billy Joel and Leah Remini perfom at the newly rennovated Nassau Coliseum, Long Island on April 5, 2017 in New York City. (Photo by Kevin Mazur/Getty Images)
NEW YORK, NY - APRIL 05: Kevin James, Leah Remini and Tony Dovolani backstage before Billy Joel perfoms at the newly rennovated Nassau Coliseum, Long Island on April 5, 2017 in New York City. (Photo by Kevin Mazur/Getty Images)
BEVERLY HILLS, CA - AUGUST 05: Actor/producer Leah Remini at the 33rd Annual Television Critics Association Awards during the 2017 Summer TCA Tour at The Beverly Hilton Hotel on August 5, 2017 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)
NEW YORK - FEBRUARY 30: 'Sting of Queens: Part One' and 'Sting of Queens: Part Two'-- Kevin begrudgingly agrees to come out of retirement briefly to reprise an undercover assignment where he and his old rival Vanessa Cellucci (Leah Remini), once again, pose as husband and wife. Also, Donna is up for a promotion, Kendra gets accepted to law school, and Chale gets a lucrative new job, on part one of the two-part first season finale of KEVIN CAN WAIT, Monday, May 1 (8:00-8:30 PM, ET/PT) and Monday, May 8 (8:00-8:30 PM, ET/PT) on the CBS Television Network. Pictured: Leah Remini, Kevin James. (Photo By Jeff Neumann/CBS via Getty Images)
NEW YORK, NY - APRIL 05: Kevin James and Leah Remini backstage before Billy Joel perfoms at the newly rennovated Nassau Coliseum, Long Island on April 5, 2017 in New York City. (Photo by Kevin Mazur/Getty Images)
WATCH WHAT HAPPENS LIVE -- Pictured: Leah Remini -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE -- Pictured: Leah Remini -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - NOVEMBER 29: Leah Remini visits the SiriusXM Studio on November 29, 2016 in New York City. (Photo by Noam Galai/Getty Images)
LAS VEGAS, NV - JULY 24: Jennifer Lopez and Leah Remini attend Jennifer Lopez's birthday at Nobu Villa Atop Nobu Hotel at Caesars Palace on July 24, 2016 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
MATCH GAME Airdate: July 17, 2016 - The iconic panel game show MATCH GAME, hosted by Golden Globe and Emmy Award-winning actor Alec Baldwin, returns to primetime airing on SUNDAYS (10-11pm, ET) on the ABC Television Network. (Photo by Heidi Gutman/ABC via Getty Images) LEAH REMINI
MY KITCHEN RULES: L-R: Guest stars Leah Remini and Vicky Marshall in the Leah Remini Gets Artsy episode of MY KITCHEN RULES airing Thursday, Feb. 16 (9:01-10:00 PM ET/PT) on FOX. (Photo by FOX via Getty Images)
LAS VEGAS, NV - JANUARY 20: Cheryl Burke, Derek Hough and Leah Remini attend the opening JENNIFER LOPEZ: ALL I HAVE at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
ENCINO, CA - APRIL 07: Kym Gold, Leah Remini and Holly Robinson Peete attend the Stella & Dot Trunk Show to benefit The HollyRod Foundation on April 7, 2016 in Encino, California. (Photo by Araya Diaz/Getty Images for Stella & Dot)
LAS VEGAS, NV - JANUARY 20: Actress Leah Remini arrives at the launch of Jennifer Lopez's residency 'JENNIFER LOPEZ: ALL I HAVE' at Planet Hollwood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by David Becker/WireImage)
LOS ANGELES, CA - DECEMBER 08: Actress Leah Remini signs copies of her new book 'Troublemaker: Surviving Hollywood and Scientology' at Barnes & Noble at The Grove on December 8, 2015 in Los Angeles, California. (Photo by Paul Archuleta/Getty Images)
WATCH WHAT HAPPENS LIVE -- Pictured: Leah Remini -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE -- Pictured (l-r): Leah Remini and Gloria Estefan -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - NOVEMBER 04: Leah Remini promotes her book 'Troublemaker: Surviving Hollywood and Scientology' at Barnes & Noble Tribeca on November 4, 2015 in New York City. (Photo by D Dipasupil/Getty Images)
THE VIEW - Leah Remini (book, Troublemaker: Surviving Hollywood and Scientology) is the guest today, Tuesday, November 3, 2015 on ABC's 'The View.' 'The View' airs Monday-Friday (11:00 am-12:00 pm, ET) on the ABC Television Network. (Photo by Lou Rocco/ABC via Getty Images)
WATCH WHAT HAPPENS LIVE -- Pictured: Leah Remini -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
LONG BEACH, CA - SEPTEMBER 21: Actress Leah Remini attends the Life is Good Supports Dream Court Opening - BGCLB event on September 21, 2015 in Long Beach, California. (Photo by Jesse Grant/Getty Images for Life is Good)
WATCH WHAT HAPPENS LIVE -- Pictured (l-r): Leah Remini and Josh Gad -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
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