Scarlett Johansson secretly married fiance Romain Dauriac on Oct. 1 in Montana, shortly after the September birth of their baby daughter, Us Weekly can confirm Credit: Rindoff Petroff/Hekimian/Getty Images

Congrats to the newlyweds! Scarlett Johansson and her French journalist beau Romain Dauriac secretly tied the knot several weeks ago, in a private ceremony officiated by Richard J. Miller on Oct. 1 in Philipsburg, Mont., a clerk for Granite County confirms to Us Weekly. A source says the "I dos" took place at the Ranch at Rock Creek.

Speculation about the 30-year-old actress' marital status reached an all-time high this week, when The New York Post's Page Six reported that the couple had wed in "a very intimate ceremony after the birth of their daughter." (They welcomed baby girl Rose Dorothy in early September.) A source told the site that they "kept the wedding a big secret because they both wanted privacy."

That report added fuel to the fire sparked by Johansson's Nov. 18 appearance at the 2nd Annual Champions of Rockaway Hurricane Sandy Benefit in New York City, where she was spotted with a thin, diamond-studded band below her eye-catching engagement ring.

A rep for the Avengers: Age of Ultron actress first confirmed her engagement in September 2013, about six months before news of her pregnancy broke in March. She remained mum on their plans for a wedding, vaguely telling WSJ. Magazine that they would "get married at some point."

Earlier in March, she told Access Hollywood she was taking a very laid-back approach to her nuptials. "Oh, I don't plan anything," she said. "I'm terrible at planning. I'm not gonna plan anything — I like to wing it!"

Johansson was previously married to Ryan Reynolds from 2008 to 2011. He wed Blake Lively in 2012; they're now expecting their first child together.

A rep for Johansson has not yet responded to a request for comment.