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Rufus Wainwright, Scarlett Johansson, Eddie Redmayne

Marion Curtis/Startraksphoto.com

It's hard to believe Scarlett Johansson gave birth to daughter Rose Dorothy Dauriac just two months ago!

The 29-year-old mother of one showed off her slim, fit post-baby body Monday while hosting a screening of The Theory of Everything at the Crosby Hotel in New York. Sandwiched between Eddie Redmayne, her co-star in 2008's The Other Boleyn Girl, and singer-songwriter Rufus Wainwright, the new mom was all smiles at her first public event since becoming a mom.

As you can see, Scarlett looked quite petite in a chic black-and-white patterned dress, which she paired with Sophia Webster pumps and natural-looking makeup. She's clearly got genetics working in her favor, but the new mom's also been hitting the gym to shed those pregnancy pounds.

Scarlett Johansson

Splash News

Of course, Scarlett—who is engaged to Rose's father, Romain Dauriac—has a lot more on her mind than getting her pre-baby bod back. She's raising a newborn, obviously, and planning a wedding at some point (a source told E! News she and Romain were "not getting married until after the baby," but now that Rose has arrived, there's no reason to postpone those "I do's" if they don't want to).  She's also already booked her first post-baby role.

Per Deadline, the new mama will be starring in and producing an eight-episode period series for TV based on Edith Wharton's novel The Custom of the Country. Scarlett will play the role of e of Undine Spragg, a young woman from the Midwest trying to finagle her way up the New York City social ladder.

SCARLETT JOHANSSON, Glamour Magazine

Tom Munro

In real life, though, Scarlett is determined to maintain a healthy work-life balance. "It seems so stressful to not be able to spend time with your family because you're constantly chasing the tail of your own success," she told The Wall Street Journal earlier this year. "There must exist a world in which I can balance those things, be able to raise a family and still make a film a year, or work on my own, develop things, do theater. I want to be able to have it all."

"I know that with that there will be some sacrifices," she said. "I know that's the struggle with working mothers and successful careers. It happens."