The 39 year old rocker asked stunning model, Elle Evans, to marry him.
The leggy blonde, 28, and Muse frontman – who has six year old son Bingham with his ex Kate Hudson – got down on one knee during a trip to Fiji earlier this month.
Alongside a picture of the pair riding horses on the beach, Elle wrote: “Was going to surprise everyone on Christmas, but just can’t wait any longer … We are so happy to announce to the world that we are engaged!
“Just a few days after my birthday, on the most romantic holiday of our lives, the man of my dreams asked me to marry him!
“After tears of joy, gasps of shock, and a split second of disbelief, of course – I said YES! I can’t imagine our lives apart.
“What I can imagine is a bright future full of love & light, family & friends, moments that turn into cherished memories, and a lifetime of pure bliss”
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Elle is most famous for her appearance in Robin Thicke’s music video Blurred Lines featuring Pharrell Williams.
Texas-born model became part of a pop culture phenomenon, and was also cast in two of Beyoncé’s music videos, Haunted and Superpower.
Matt is said to be over the moon with his new fiancée and is thankful to have her by his side in this hectic world.
“In my personal life, I’m pretty grateful, pretty happy. But when you look at what governments and corporations have done to the planet with warfare and environmental destruction, there’s a constant feeling of discord,” he said previously.
He was once asked what is the one essential he likes to take on tour, and admitted: “A girlfriend. That definitely makes touring a lot easier.”