Nikki Reed and Paul McDonald married at a private ranch in Malibu, Calif. on Sunday.
The small wedding was attended by 100 guests, a rep confirmed to Us Magazine.
We couldn't be happier! the newlyweds said in a statement to the magazine.
[We were] surrounded by our family and friends. We're so glad this day has come! they added.
Reed, 23, is perhaps most famous for her role as Rosalie Hale in the Twilight film series. The actress is gearing up for the final two installments of the popular film adaptations based on the popular vampire novels by Stephenie Meyer.
Reed first met McDonald in March, when the two attended the premiere of Red Riding Hood (starring Amanda Seyfried and Gary Oldman). The couple were engaged two months later.
I love her to death... she's amazing. It's kind of one of those thing you don't expect... like, last year I never would have thought I'd be getting married. She's amazing. She's the perfect girl. We fit each other. When you know, you know, and she's the one, McDonald to MTV News in June.
McDonald, 27, hails from the land of American Idol. The Alabama native competed in season 10 and finished 8th overall.
At the Malibu wedding, the couple was joined by Idol alum Stefano Langone, members of McDonald's band the Grand Magnolias, and actress Alexa Vega, who served as Reed's maid of honor, E! News reports.
On Monday, Reed took to Twitter to recap her wedding weekend.
Yesterday was the most magical day of my life, she wrote.
McDonald echoed his new wife's Twitter activity.
Yesterday was the most amazing day of my life ..everything was perfect. I am officially a MARRIED MAN! Woohoo! McDonald wrote.
The Twilight Saga: Breaking Dawn - Part 1 arrives in theaters on Nov. 18.
Last week, Reed appeared in a special video to launch the Twilight Time Capsule, an interactive site that allows Twilight fans to share photos, videos and comments related to all things Twilight.