As PEOPLE reports, the pair got married over the weekend and shared the exciting news on social media on Monday.
Mara posted a dreamy photo of her and Bell kissing at the wedding in blurry lights and smoke.
Bell shared the same photo with the caption "Mr. and Mrs. B."
The acting power couple met on the set of Fantastic Four in 2014, EW reports. Bell has a four-year-old son with former wife Evan Rachel Wood.
Speaking of the dynamic of dating a fellow actor, Mara told PEOPLE: “You constantly have to shift things, and communicate. Like asking, ‘What’s your deal with that show or with this movie,’ to make sure that you actually can see each other.”
Mara added: “We’re on the same page though, so that helps.”
Congratulations to the happy couple!