Scarlett Johansson will reportedly tie the knot with long-time fiancé Romain Dauriac

Page Six reports that the 29-year-old dropped the news to guests at Martha Stewart's party at her East Hampton home.

The wedding venue is still a closely guarded secret, but there are already rumors that the star will either marry in Paris, Dauriac's hometown, or in the Hamptons, where the couple has been spending most of the summer.

But the Don Jon actress has confessed that she would probably "wing it" on her wedding day. In a previous interview she was quoted saying, "I don't plan anything. I'm terrible at planning. Yeah, I'm not gonna plan anything-I like to wing it!"

The "Avengers: Age of Ultron" star has been engaged to the 32-year-old French journalist since September last year. They started dating in November 2012. They met through a mutual friend, tattoo artist Fuzi Uvtpk, bonding over their love for art.

The lovely couple is also expecting their first child together, due this fall. She was seen finally flaunting her baby bump in NYC, July 15. It was the first time the actress was spotted with her baby bump in public since the pregnancy announcement in  March.

Johansson's much-anticipated Luc Besson sci-fi movie "Lucy" opens on Friday, so the 29-year-old actress will be busy promoting the flick before the wedding and the imminent birth of their first child.

Also starring Morgan Freeman, Analeigh Tipton and Choi Min Sik among others, the movie hits theaters in the U.S. on July 25.