Just days after vacationing with Kourtney and the Kardashian-Jenner family in Costa Rica, the Daily Mail released images of the 33-year-old reality star getting straddled by a woman wearing a nude thong swimsuit, while in a hotel pool in Miami, Florida. In the images, the two are seen laughing, smoking and sipping what looks to be cocktails while hugging up on one another.
A source confirms to ET that the woman is 20-something model, J Lynne, whose real name is Jessica Harris. On Monday, she captioned a photo from a sunny location, with the caption: "And in the midst of the crazy, I am still at peace."
LAS VEGAS, NV - FEBRUARY 21: Television personalities Scott Disick (L) and Kourtney Kardashian appear at 1 OAK Nightclub at The Mirage Hotel & Casino on February 21, 2015 in Las Vegas, Nevada. (Photo by David Becker/WireImage)
LAS VEGAS, NV - MAY 23: Television personality Kourtney Kardashian attends Scott's birthday celebration at 1 OAK Nightclub at The Mirage Hotel & Casino on May 23, 2015 in Las Vegas, Nevada. (Photo by Steven Lawton/FilmMagic)
Madly in love with my little Reign Aston Disick.
BRIDGEHAMPTON, NY - AUGUST 09: TV Personality Kourtney Kardashian and husband Scott Disick attend Women's Health Hosts Hamptons 'Party Under The Stars' for RUN10 FEED10 at Bridgehampton Tennis and Surf Club on August 9, 2014 in Bridgehampton, New York. (Photo by Paul Zimmerman/Getty Images for Women's Health)
WEST HOLLYWOOD, CA - MARCH 02: Television personalities Kim Kardashian (L) and Kourtney Kardashian attend the 22nd Annual Elton John AIDS Foundation Academy Awards Viewing Party at The City of West Hollywood Park on March 2, 2014 in West Hollywood, California. (Photo by Jamie McCarthy/Getty Images for EJAF)
NEW YORK, NY - JUNE 12: Kourtney Kardashian and Scott Disick are seen in Sag Harbor on June 12, 2014 in New York City. (Photo by David Krieger/Bauer-Griffin/GC Images)
NEW YORK, NY - JUNE 26: Kourtney Kardashian,Kendall Jenner and Kris Jenner are seen in the Meat Packing District on June 26, 2014 in New York City. (Photo by Alo Ceballos/GC Images)
LAS VEGAS, NV - NOVEMBER 07: Kris Jenner (R) and Scott Disick (L) celebrates Kris Jenner's birthday at 1 OAK nightclub at the Mirage Hotel and Casino on November 7, 2014 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LOS ANGELES, CA - SEPTEMBER 26: Kourtney Kardashian and Scott Disick are seen on September 26, 2014 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - APRIL 08: (L-R) Kourtney Kardashian and Kim Kardashian attend as Nicole Richie, Rivka Sophia Rossi, Hayden Slater and friends host Marianne Williamson, Independent Candidate for Congress, CA 33 event at Kayne Griffin Corcoran Gallery on April 8, 2014 in Los Angeles, California. (Photo by Tibrina Hobson/Getty Images)
LOS ANGELES, CA - OCTOBER 16: Scott Disick and Kourtney Kardashian are seen on October 16, 2014 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
NEW YORK, NY - FEBRUARY 16: Harry Smith, Kim Kardashian, Kourtney Kardashian and Khloe Kardashian attend the Generation NXT charity benefit at 1OAK on February 16, 2014 in New York City. (Photo by Dave Kotinsky/Getty Images)
NEW YORK, NY - MAY 31: (L-R) Television personalities Kourtney Kardashian and Scott Disick are seen on May 31, 2014 in New York City. (Photo by NCP/Star Max/GC Images)
PARIS, FRANCE - MAY 22: Kourtney Kardashian and Scott Disick arrive at the 'Baby Dior' store on May 22, 2014 in Paris, France. (Photo by Marc Piasecki/GC Images)
MIAMI BEACH, FL - MARCH 12: Kourtney Kardashian and Scott Disick are sighted arriving back to their hotel in South Beach on March 12, 2014 in Miami Beach, Florida. (Photo by Dave Lee/GC Images)
LOS ANGELES, CA - MARCH 11: Kourtney Kardashian and Scott Disick are seen at LAX airport on March 11, 2014 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
WEST HOLLYWOOD, CA - OCTOBER 23: Kourtney Kardashian and photographer Brian Bowen Smith attend the Brian Bowen Smith WILDLIFE show hosted by Casamigos Tequila at De Re Gallery on October 23, 2014 in West Hollywood, California. (Photo by Rochelle Brodin/Getty Images)
WEST HOLLYWOOD, CA - MARCH 02: (L-R) Kim Kardashian, Sir Elton John and Kourtney Kardashian attend the 22nd Annual Elton John AIDS Foundation Academy Awards Viewing Party at The City of West Hollywood Park on March 2, 2014 in West Hollywood, California. (Photo by Jamie McCarthy/Getty Images for EJAF)
Kourtney, 37, and Scott have not been a couple since the summer of 2015, though the two continuously spark reconciliation rumors by sharing photos of one another on social media. Just a few days ago, Scott shared a pic of his ex in a swimsuit tending to their youngest son, Reign, on a private airplane, presumably while on their vacation in Costa Rica. "Mom," he simply captioned the image.
Our source claims that Kourtney wasn't thrilled about Scott going to Costa Rica with the family, and says he's been partying more often lately. In addition to his trip to Miami, the source alleges that Scott also had some late nights at the Sundance Film Festival last week.
Last night with bae❤️ #kyliejenner snatch pony by @jenatkinhair and makeup by me! #makeupbyariel
They made the flame emoji for me
Ca$h me ousside.
Shade + a Vacay @kyliejenner 🌴💯 @makeupbyariel #JenAtkinHair 📸 @mrmikerosenthal
Touristing w @mrmikerosenthal 🙇🏻❤️🌴
Off to see the plug..🚁
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Despite Scott's apparent partying, the source adds that the former couple are good about raising their children -- Mason, 7, Penelope, 4, and Reign, 2 -- in an amicable manner. "Kourtney and Scott do an incredible job of co-parenting and truly are unmatched when it comes to putting on a strong front with the kids," the source explains. "They never discuss any of their issues in front of the kids."