The stunning model took to her official Instagram account to make the announcement on Tuesday.
The 27-year-old shared a romantic snap of herself alongside her beau as the pair gazed deeply into each other’s eyes while stood barefoot on a beach in a loving embrace.
Brittny looked incredible in a silky blue thigh-high dress which teased at her lithe pins, while Jenson, 38, opted for a smart suit of the same colour for the joyful occasion.
The Californian-born babe captioned the the sweet snap: “Soon to be Mrs Button.”
And fans of the pair quickly inundated them with congratulatory messages.
A third added: “Beautiful shot of you two gorgeous humans, congratulations.”
And a fourth continued: “Congratulations! Here’s to a future of a smooth ride, facing life side by side. Work to keep it as you both like it.”
Brittny and her sportstar fiance have been dating for two years, going public with their relationship in 2016, just three months after he split with wife of 12 months Jessica Michibata.
Despite a rather up and down relationship which included a short break in 2011, the pair got engaged in 2014 after Jenson presented the gorgeous brunette with a dazzling ring reportedly worth £250,000.
However they split just one year after marrying in a lavish ceremony in Hawaii.
Meanwhile the bombshell made her first appearance as a Playboy model in January 2015.
She was previously romantically linked to Twilight star Kellan Lutz.