Rebecca Ferguson

Rebecca Ferguson plays a spy in the "Mission: Impossible" franchise, and she may make a great one offscreen as well, because the Swedish actress is great at keeping a secret.

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Ferguson, 35, revealed she secretly married her longtime boyfriend, Rory, over the holidays — and his last name is still a secret from the world.

"[It means] nothing. I think we both wanted to step over all thresholds. Also, I'm not very religious. I believe in love," she told "Extra" on Wednesday. "It was more for us and our family. We rented a cottage with friends and family and Wellington boots and big wooly socks and big ruggy jumpers."

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She added that they played games, table tennis and snooker, a game similar to billiards.

Ferguson, who stars in the upcoming "The Kid Who Would Be King," also said her 11-year-old son, Isaac (who she shares with ex-boyfriend Ludwig Hallberg), served as their ringbearer, while her six-month-old daughter slept through the ceremony.

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Aside from the secrecy, Ferguson's wedding dress also eschewed tradition.

She explained, "I wore a beautiful skirt, a wedding skirt, that I can shorten off, get some pockets in, and use in Greece for the summer ... I am practical!"