'Baywatch' actress Kelly Rohrbach and Walmart heir Steuart Walton may be planning $1.5 million wedding

Next time you're on a long train ride, mute your headphones.

In a series of now-deleted tweets, author Cat Marnell said she sat across from Walmart heir Steuart Walton during a recent five-hour train through Switzerland. As the train chugged along, Walton allegedly spilled details of his million-dollar wedding through multiple revealing phone calls, according to Page Six.

The 38-year-old billionaire has been dating "Baywatch" actress Kelly Rohrbach, 29, since spring 2017. Rohrbach was on the receiving end of at least one of Walton's calls, Marnell claimed -- and despite Walton's massive fortune, their wedding budget reportedly maxes out at $1.5 million.

Marnell was "listening to him call fiancée Kelly Rohrbach" before Walton ended the call to "b--ch out ... their wedding planner. Actual quote: 'A $20k sandcastle is not required to have a good time.'"

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Kelly Rohrbach out and about
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Kelly Rohrbach out and about
BEVERLY HILLS, CA - MARCH 04: Model Kelly Rohrbach attends the 2018 Vanity Fair Oscar Party hosted by Radhika Jones at Wallis Annenberg Center for the Performing Arts on March 4, 2018 in Beverly Hills, California. (Photo by John Shearer/Getty Images)
Kelly Rohrbach arrives at the Vanity Fair Oscar Party on Sunday, March 4, 2018, in Beverly Hills, Calif. (Photo by Evan Agostini/Invision/AP)
Actress Kelly Rohrbach during a photocall on the occasion of the film "Baywatch" in Berlin, Tuesday, May 30, 2017. The film will premiere in German cinemas on June 1, 2017. (J'rg Carstensen/dpa via AP)
Kelly Rohrbach attends the Harper's BAZAAR 'Icons by Carine Roitfeld' party at The Plaza Hotel on Friday, Sept. 8, 2017, in New York. (Photo by Charles Sykes/Invision/AP)
Kelly Rohrbach attends a "Baywatch" screening, hosted by The Cinema Society and Hugo by Hugo Boss, at Landmark Sunshine Cinema on Monday, May 22, 2017, in New York. (Photo by Charles Sykes/Invision/AP)
Kelly Rohrbach attends the "Baywatch" Slow Motion Marathon held at Microsoft Square at L.A. Live on Saturday, April 22, 2017, in Los Angeles. (Photo by John Salangsang/Invision/AP)
Model Kelly Rohrbach arrives at the Vanity Fair Oscar Party on Sunday, Feb. 26, 2017, in Beverly Hills, Calif. (Photo by Evan Agostini/Invision/AP)
Kelly Rohrbach attends the 2016 GQ Men of the Year Party on Thursday, Dec. 8, 2016, in West Hollywood, Calif. (Photo by Richard Shotwell/Invision/AP)
Photo by: Demis Maryannakis/STAR MAX/IPx 10/17/16 Kelly Rohrbach at The 10th Annual Golden Heart Awards Celebration at Spring Studios. (NYC)
Model Kelly Rohrbach attends the 2016 Sports Illustrated Swimsuit Issue launch party at Brookfield Place on Tuesday, Feb, 16, 2016, in New York. (Photo by Evan Agostini/Invision/AP)
Kelly Rohrbach attends LACMA 2015 Art+Film Gala at LACMA on November 7, 2015 in Los Angeles, California. (Photo by Jordan Strauss/Invision/AP)
Kelly Rohrbach arrives at the InStyle and Warner Bros. Golden Globes afterparty at the Beverly Hilton Hotel on Sunday, Jan. 10, 2016, in Beverly Hills, Calif. (Photo by Matt Sayles/Invision/AP)
Photo by: JMA/STAR MAX/IPx 11/5/15 Kelly Rohrbach at The Fallout 4 Video Game Launch. (Los Angeles, CA)
Kelly Rohrbach attends the La Mer "Celebration of an Icon" Event at Siren Studios on Tuesday, Oct. 13, 2015, in Los Angeles. (Photo by Paul A. Hebert/Invision/AP)
Photo by: Demis Maryannakis/STAR MAX/IPx 9/30/15 Kelly Rohrbach at Evolve Media's Exclusive Celebration For The Relaunch Of CraveOnline.com at Provocateur. (NYC)
Kelly Rohrbach attends Cantor Charity Day 2015 hosted by Cantor Fitzgerald and BGC Partners on Friday, Sept. 11, 2015, in New York. (Photo by Andy Kropa/Invision/AP)
Photo by: XPX/STMX/AKM/GSI ©2014 ALL RIGHTS RESERVED 2015 7/10/15 Kelly Rohrbach is seen in SoHo. (NYC)
Photo by: Demis Maryannakis/STAR MAX/IPx 4/6/15 Kelly Rohrbach at Jeffrey Fashion Cares 2015 at ArtBeam. (NYC)
Model Kelly Rohrbach attends Russell James' "Seminole Spirit" photo exhibition opening at the Stephan Weiss Studio on Tuesday, Feb. 17, 2015, in New York. (Photo by Evan Agostini/Invision/AP)
Photo by: Demis Maryannakis/STAR MAX/IPx 2/9/15 Kelly Rohrbach at The Sports Illustrated Swim City Event. (NYC)
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According to Marnell's subtle spying, the two plan to wed on Harbor Island in the Bahamas.

"He also called his lawyer ... and worked on his prenup or life insurance policy," she wrote, quoting him as saying, "'I don't want to incentivize my death.'"

Both Rohrbach and Walton are Georgetown grads: Rohrbach went there for undergrad while Walton attended for law school.

Walton's grandfather, Sam Walton, opened the first official Walmart in 1962 after several years of purchasing and managing small stores throughout Arkansas.

Rohrbach, who previously dated Leonardo DiCaprio, became Sports Illustrated's Rookie of the Year in its 2015 Swimsuit Issue.

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