The 90210 starlet, 23, wed British model, Josh Beech, she revealed on Twitter Friday.
"I now pronounce us Mr. and Mrs. Beech! Ahhh!" she writes, adding a wedding photo of the couple kissing.
Grimes, whose CW drama will not return for another season, got engaged in December, and thanked fans for all the "warm wishes" about her exciting news.
"I'm a very happy lady indeed," she blogged around the time of the proposal. "We plan to keep our special day very private and we hope everyone can respect that. Thanks for the love, right back atcha!"