The actress and model sported a diamond engagement ring in a photo posted by her new fiancé, Australian stuntman Ben Smith-Petersen.
“So that happened,” he captioned the pic with Keough, 25.
She is believed to have met her new fiancé on the set of Mad Max: Fury Road, which she stars in and he worked on as a stuntman. The two were first spotted out together in Los Angeles in January.
Keough’s rep has not responded to calls asking for comment.