Jennifer Lawrence on why fiance Cooke Maroney is the one (Exclusive)

Getting engaged to Cooke Maroney was an "easy decision" for Jennifer Lawrence. 

ET's Nischelle Turner spoke with the 28-year-old actress at the premiere of her movie, X-Men: Dark Phoenix, at TCL Chinese Theatre in Los Angeles, California, on Tuesday, where she opened up about her new relationship status and why Maroney was the one. 

"Well, he's just the best person I've ever met in my whole life," Lawrence said of her fiance. "It was a very, very easy decision."

News broke that Lawrence was engaged to Maroney, a 34-year-old art director, in February, after she was spotted rocking a diamond sparkler on her ring finger while out to dinner in New York City. The pair were first romantically linked last June. 

Lawrence walked the red carpet solo at Tuesday's premiere, celebrating what is likely her last movie for the X-Men franchise. 

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X-Men: Dark Phoenix premiere
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X-Men: Dark Phoenix premiere
HOLLYWOOD, CALIFORNIA - JUNE 04: Joe Jonas and Sophie Turner attend the premiere of 20th Century Fox's "Dark Phoenix" at TCL Chinese Theatre on June 04, 2019 in Hollywood, California. (Photo by Rich Fury/Getty Images)
HOLLYWOOD, CALIFORNIA - JUNE 04: Sophie Turner attends the premiere of 20th Century Fox's "Dark Phoenix" at TCL Chinese Theatre on June 04, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JUNE 04: Sophie Turner and Joe Jonas attend the premiere of 20th Century Fox's "Dark Phoenix" at TCL Chinese Theatre on June 04, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JUNE 04: Jennifer Lawrence attends the premiere of 20th Century Fox's "Dark Phoenix" at TCL Chinese Theatre on June 04, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CA - JUNE 04: Jennifer Lawrence arrives for the Premiere Of 20th Century Fox's "Dark Phoenix" held at TCL Chinese Theatre on June 4, 2019 in Hollywood, California. (Photo by Albert L. Ortega/Getty Images)
HOLLYWOOD, CALIFORNIA - JUNE 04: Jessica Chastain attends the premiere of 20th Century Fox's "Dark Phoenix" at TCL Chinese Theatre on June 04, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JUNE 04: Jessica Chastain attends the premiere of 20th Century Fox's "Dark Phoenix" at TCL Chinese Theatre on June 04, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JUNE 04: Nicholas Hoult attends the premiere of 20th Century Fox's "Dark Phoenix" at TCL Chinese Theatre on June 04, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JUNE 04: Alexandra Shipp attends the premiere of 20th Century Fox's "Dark Phoenix" at TCL Chinese Theatre on June 04, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JUNE 04: James McAvoy attends the premiere of 20th Century Fox's "Dark Phoenix" at TCL Chinese Theatre on June 04, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JUNE 04: Michael Fassbender attends the Premiere Of 20th Century Fox's "Dark Phoenix" at TCL Chinese Theatre on June 04, 2019 in Hollywood, California. (Photo by Jon Kopaloff/FilmMagic)
HOLLYWOOD, CALIFORNIA - JUNE 04: Tye Sheridan attends the premiere of 20th Century Fox's "Dark Phoenix" at TCL Chinese Theatre on June 04, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CA - JUNE 04: Kota Eberhardt arrives for the Premiere Of 20th Century Fox's "Dark Phoenix" held at TCL Chinese Theatre on June 4, 2019 in Hollywood, California. (Photo by Albert L. Ortega/Getty Images)
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"[Sophie Turner] absolutely did [give Mystique a good ending]," she shared. "That's not a lie. That's true. She really did."

The actress has played Mystique since 2011's X-Men: First Class, and joked to ET that all that blue has made her ready to take a break from full-body makeup for a while. "I don't even think I'll do aging makeup ever -- just nothing. Stop painting my face, except for this," she said. "I was blown away, really. They did not hold back with the ending of this movie, and it was quite emotional."

"If you watch the series of the movies, you'll see there's like, writing around my blue," Lawrence dished of the scripts, which have featured her less and less in Mystique's natural blue state. "The first movie I ended like, 'Mutant and proud!' And then the second movie, I was like, 'I changed my mind.' It's tough. It's a long time in the makeup chair." 

Dark Phoenix sees the X-Men face the full power of the Phoenix (Turner) after a mission goes wrong. The latest installment in the X-Men franchise hits theaters on Friday. 

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Jennifer Lawrence out and about
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Jennifer Lawrence out and about
NEW YORK, NY - SEPTEMBER 25: Actor and Board Member of RepresentUs Jennifer Lawrence speaks onstage during the 2018 Concordia Annual Summit - Day 2 at Grand Hyatt New York on September 25, 2018 in New York City. (Photo by Leigh Vogel/Getty Images for Concordia Summit)
NEW YORK, NY - SEPTEMBER 25: Actor and Board Member of RepresentUs Jennifer Lawrence speaks onstage during the 2018 Concordia Annual Summit - Day 2 at Grand Hyatt New York on September 25, 2018 in New York City. (Photo by Riccardo Savi/Getty Images for Concordia Summit)
NEW YORK, NY - MAY 30: Jennifer Lawrence speaks onstage during the BAM Gala 2018 honoring Darren Aronofsky, Jeremy Irons, and Nora Ann Wallace at Brooklyn Cruise Terminal on May 30, 2018 in New York City. (Photo by Theo Wargo/Getty Images for Brooklyn Academy of Music)
NEW YORK, NY - MAY 30: Darren Aronofsky (L) and Jennifer Lawrence attend the BAM Gala 2018 honoring Darren Aronofsky, Jeremy Irons, and Nora Ann Wallace at Brooklyn Cruise Terminal on May 30, 2018 in New York City. (Photo by Cindy Ord/Getty Images for Brooklyn Academy of Music)
HOLLYWOOD, CA - MARCH 04: Actor Jennifer Lawrence attends the 90th Annual Academy Awards at Hollywood & Highland Center on March 4, 2018 in Hollywood, California. (Photo by Dan MacMedan/WireImage)
HOLLYWOOD, CA - MARCH 04: Jennifer Lawrence attends the 90th Annual Academy Awards at Hollywood & Highland Center on March 4, 2018 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CA - MARCH 04: Jennifer Lawrence attends the 90th Annual Academy Awards at Hollywood & Highland Center on March 4, 2018 in Hollywood, California. (Photo by Christopher Polk/Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Jennifer Lawrence -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured (l-r): Bethenny Frankel, Jennifer Lawrence and Luann de Lesseps -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - FEBRUARY 28: Actress Jennifer Lawrence (R) visits 'Andy Cohen Live' hosted by Andy Cohen (L) on his exclusive SiriusXM channel Radio Andy at the SiriusXM Studios on February 28, 2018 in New York City. (Photo by Ben Gabbe/Getty Images)
NEW YORK, NY - FEBRUARY 26: Jennifer Lawrence seen on the streets of Manhattan on February 26, 2018 in New York City. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK - FEBRUARY 26: The Late Show with Stephen Colbert and guest Jennifer Lawrence during Monday's February 26, 2018 show. (Photo by Scott Kowalchyk/CBS via Getty Images)
NEW YORK, NY - FEBRUARY 26: Actress Jennifer Lawrence attends the 'Red Sparrow' premiere at Alice Tully Hall at Lincoln Center on February 26, 2018 in New York City. (Photo by Taylor Hill/FilmMagic)
NEW YORK, NY - FEBRUARY 26: Jennifer Lawrence attends the 'Red Sparrow' New York premiere at Alice Tully Hall at Lincoln Center on February 26, 2018 in New York City. (Photo by Michael Stewart/FilmMagic)
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