Mommy's little Marlowe! In a rare moment, Sienna Miller opened up about her baby girl Marlowe, 2, and motherhood during the Foxcatcher premiere in London on Thursday, Oct. 16.

The Brit actress, 32, has several films in the works for 2015, but has luckily managed to balance both her personal and professional life with the help of actor fiance Tom Sturridge.

"We take turns," she said of Marlowe's dad, 28. "It's difficult, but the great thing is she's still small enough where she can come with me everywhere."

"I really wanted to knuckle down this year and get a lot under my belt, so she started nursery [school] about a month ago," the Black Mass star added. "And to get to a point where I could kind of be a bit more selective so hopefully now that I've put in all this work this year I'll be able to have an easier time this year and the year after."

Miller's Marlowe update ironically came on the same day that Us confirmed that her ex Jude Law is expecting his fifth child. (The first with ex-girlfriend Catherine Harding.)

Law famously cheated on Miller with his children's nanny, Daisy Wright, in February 2006. (Law also shares sons Rafferty, 17, and Rudy, 11, and daughter Iris, 13, with ex-wife Sadie Frost, and has daughter Sophia, 4, with ex Samantha Burke.) Law and Miller rekindled their romance, but called it quits for the second time in February 2011.

Watch the red carpet video now!