Published Saturday, 08 December 2012
The 90210 star has been dating the 24-year-old hunk since earlier this year, and they sparked rumours of an upcoming wedding back in September when she was spotted wearing a ring on her left hand.
Grimes has now reached out to fans to confirm she is set to walk down the aisle.
In a post on her Twitter page, she writes: "I'm engaged."
After receiving an outpouring of well wishes from fans, she added: "Thanks for all the congratulations everyone, I'm a very happy lady indeed and all the warm wishes are well appreciated!
"We plan to keep our special day very private and we hope everyone can respect that. Thanks for the love, right back atcha!"