The "Mad Max: Fury Road" actress, 28, and the "Spy" star, 48, who have been together for five years, walked the red carpet on Sunday at the 73rd Golden Globe Awards arm-in-arm and Huntington-Whitely's ring sparkled as much as her shimmery Atelier Versace gown.
The engagement news follows their return from Phuket, Thailand, where they spent the holidays beachside.
Though the couple remains private about their love life, they did offer tidbits about their romance over the last year.
"We're best mates," Huntington-Whiteley said in the April 2015 issue of Self magazine. "He makes me laugh every day. I almost feel like I never had a proper boyfriend before!"
"We get drunk and float around the swimming pool," Statham joked in an Esquire interview published in May.
The British actor and his "Spy" costar, Melissa McCarthy, hit the stage at the Golden Globes show to introduce their summer comedy, which was up for the award for motion picture comedy, but fell to Matt Damon's "The Martian."
E! News was first to report the engagement.