Sienna Miller with baby daughter Marlowe in Central Park, New York City on October 6th, 2012. Credit:

Marlowe takes Manhattan!

On Saturday, Sienna Miller hit NYC's Central Park with her adorable three-month-old daughter, Marlowe, in tow.

Clad in a white button-down, jeans and wayfarers, Miller, 30, hung out on a park bench with her baby girl, her first child with boyfriend Tom Sturridge, 26.

The notoriously private British beauty hasn't talked much about how life as a first-time mom is treating her so far, although she did admit things were a bit of a blur one month into motherhood.

"She's so cute," Miller, calling in to HBO's Summer Television Critics Association panel August 1, gushed. "She's screaming upstairs. My brain doesn't work!"

Us Weekly broke the news of Miller's pregnancy in January; in the April issue of British Vogue, the then-mama-to-be opened up about expecting her first child.

"I'm in my second trimester, so I'm I-can-talk-about-it pregnant," The Girl actress shared. "I'm feeling fine . . . It's all progressing nicely and it's very exciting."