Natalie Portman reveals who's the better kisser between Mila Kunis and Ashton Kutcher

Natalie Portman is choosing sides when it comes to her best on-screen kisses.

The 37-year-old actress stopped by Watch What Happens Live With Andy Cohen on Tuesday and dished about kissing both Ashton Kutcher and Mila Kunis.

Portman co-starred with Kutcher in 2011's No Strings Attached, and also shared the big screen with Kunis in Black Swan a year prior. Both roles required some hot and heavy make-out scenes, something Portman readily pointed out during the show's "Dish On A Star" segment.

"I've kissed them both," she bragged.

Cohen jumped right in, asking Portman, "Who's the better kisser?"

"Mila!" Portman exclaimed without pause. "I mean, obviously."

It seems Kunis is a fan of Portman's kissing too! In a Reddit AMA back in 2015, Kunis said that Portman is "a lovely kisser, very polite."

While Portman may have preferred Kunis' kisses, Kutcher got a positive rating on his lip-locking abilities from another actress, Amanda Peet.

During Peet's October appearance on WWHL, she initially rated Kutcher's on-screen kissing in the 2005 film A Lot Like Love a nine, before quickly downgrading it to an eight. 

21 PHOTOS
Mila Kunis and Ashton Kutcher through the years
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Mila Kunis and Ashton Kutcher through the years
LOS ANGELES, CA - OCTOBER 19: Ashton Kutcher (L) and Mila Kunis attend game 4 of the NLCS between the Chicago Cubs and the Los Angeles Dodgers at Dodger Stadium on October 19, 2016 in Los Angeles, California. (Photo by Noel Vasquez/GC Images)
LAS VEGAS, NV - MAY 22: (L-R) Actors Ashton Kutcher and Mila Kunis attend the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Todd Williamson/BBMA2016/Getty Images for dcp)
LAS VEGAS, NV - MAY 22: (L-R) Actors Ashton Kutcher, Mila Kunis, and singer Demi Lovato attend the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Todd Williamson/BBMA2016/Getty Images for dcp)
THAT 70'S SHOW (TV - 1998) DANNY MASTERSON, LAURA PREPON, ASHTON KUTCHER, TOPHER GRACE, MILA KUNIS, WILMER VALDERAMA T70S 002
PITTSBURGH, PA - SEPTEMBER 22: Ashton Kutcher and Mila Kunis look on from the sidelines before the game between the Chicago Bears and the Pittsburgh Steelers on September 22, 2013 at Heinz Field in Pittsburgh, Pennsylvania. (Photo by Justin K. Aller/Getty Images)
LOS ANGELES, CA - MARCH 22: Mila Kunis (L) and Ashton Kutcher attend a basketball between the Detroit Pistons and the Los Angeles Clippers at Staples Center on March 22, 2014 in Los Angeles, California. (Photo by Noel Vasquez/GC Images)
THAT 70'S SHOW (TV - 1998) TOPHER GRACE, WILMER VALDERAMA, DANNY MASTERSON, MILA KUNIS, LAURA PREPON, ASHTON KUTCHER T70S 001
Apr. 10, 2002 - Hollywood, CALIFORNIA, USA - DON STARK, DEBRA JO RUPP, KURTWOOD SMITH, WILMER VALDERRAMA, LAURA PREPON, DANNY MASTERSON, ASHTON KUTCHER, MILA KUNIS, TOPHER GRACE..THAT 70S SHOW CELEBRATES ITS 100TH EPISODE WITH A PARTY AT.SUNSET ROOM, HOLLYWOOD, CA.APRIL 10, 2002. NINA PROMMER/ 2002 K24623NP(Credit Image: © Globe Photos/ZUMAPRESS.com)
LOS ANGELES, CA - MARCH 22: Mila Kunis (L) and Ashton Kutcher attend a basketball between the Detroit Pistons and the Los Angeles Clippers at Staples Center on March 22, 2014 in Los Angeles, California. (Photo by Noel Vasquez/GC Images)
LOS ANGELES, CA - JANUARY 03: Ashton Kutcher (L) and Mila Kunis attend a basketball game between the Utah Jazz and the Los Angeles Lakers at Staples Center on January 3, 2014 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images)
LOS ANGELES, CA - JANUARY 03: Ashton Kutcher (L) and Mila Kunis attend a basketball game between the Utah Jazz and the Los Angeles Lakers at Staples Center on January 3, 2014 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images)
INDIO, CA - APRIL 27: (L-R) Actors Jordy Masterson, Mila Kunis and Ashton Kutcher seen during day 3 of 2014 Stagecoach: California's Country Music Festival at the Empire Polo Club on April 27, 2014 in Indio, California. (Photo by Frazer Harrison/Getty Images for Stagecoach)
LOS ANGELES, CA - SEPTEMBER 29: Mila Kunis and Ashton Kutcher arrive at LAX (Los Angeles International Airport). on September 29, 2013 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
INDIO, CA - APRIL 25: Actors Ashton Kutcher and Mila Kunis attend day 1 of 2014 Stagecoach: California's Country Music Festival at the Empire Polo Club on April 25, 2014 in Indio, California. (Photo by Frazer Harrison/Getty Images for Stagecoach)
LOS ANGELES, CA - FEBRUARY 12: Mila Kunis (L) and Ashton Kutcher attend a basketball game between the Phoenix Suns and the Los Angeles Lakers at Staples Center on February 12, 2013 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images)
OAKLAND, CA - JUNE 5: Ashton Kutcher and Mila Kunis attend Game Two of the 2016 NBA Finals between the Golden State Warriors and the Cleveland Cavaliers on June 5, 2016 at ORACLE Arena in Oakland, California. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. Mandatory Copyright Notice: Copyright 2016 NBAE (Photo by Andrew D. Bernstein/NBAE via Getty Images)
LAS VEGAS, NV - MAY 22: (L-R) Actors Ashton Kutcher and Mila Kunis attend the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Todd Williamson/BBMA2016/Getty Images for dcp)
LAS VEGAS, NV - MAY 22: (L-R) Actors Ashton Kutcher, Mila Kunis, and singer Demi Lovato attend the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Todd Williamson/BBMA2016/Getty Images for dcp)
LOS ANGELES, CA - MARCH 28: Mila Kunis and Ashton Kutcher are seen at 'Jimmy Kimmel Live' on March 28, 2016 in Los Angeles, California. (Photo by RB/Bauer-Griffin/GC Images)
LOS ANGELES, CA - DECEMBER 19: Mila Kunis (L) and Ashton Kutcher attend a basketball game between the Oklahoma City Thunder and the Los Angeles Lakers at Staples Center on December 19, 2014 in Los Angeles, California. (Photo by Noel Vasquez/GC Images)
AUSTIN, TX - MARCH 14: Founder of A-Grade Investments Guy Oseary, Actor Ashton Kutcher and Mila Kunis attend The Launch Of Ashton Kutcher & Guy Oseary's Sound Ventures At SXSW on March 14, 2015 in Austin, Texas. (Photo by Anna Webber/Getty Images for SOUND)
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After realizing that her husband, Game of Thrones showrunner David Benioff, should be included in the mix, Peet admitted that she needed to be "more discerning" with her rating scale.

“I don’t think you can rate somebody, because it’s just so subjective,” she said. “Like, some people like tongue!”

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