Sienna Miller Baby | First Pictures

Sienna Miller's baby, Marlowe Ottoline Layng Sturridge, was spotted for the first time yesterday! New mom Sienna brought her little one along on a frozen yogurt run. Sienna's sister, Savannah Miller, also toted her youngest child during the outing. Sienna and her rumored fiancé, Tom Sturridge, welcomed baby Marlowe in early July. Marlowe is the first child for both Tom and Sienna.

Sienna had to break from her new mom duties temporarily last week to do a small bit of press for her HBO project The Girls, which is based on director Alfred Hitchcock's relationship with and obsession for actress Tippi Hedren. Sienna briefly touched on the topic of Marlowe, saying, "She's so cute . . . She's screaming upstairs. My brain doesn't work." Another of Sienna's projects, a movie called Two Jacks, is also in the news. Two Jacks will debut at the Montreal Film Festival at the end of the month, though there's no word yet on whether Sienna will travel to support the picture.