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It was a fashion double-take at the Hamptons International Film Festival this weekend, where Sienna Miller celebrated her new film, The Girl, in a white dress with cape-like sleeves by Alessandra Rich, a fellow Brit who launched her line in 2009. “I’m happy to support a new designer,” the actress—in her first post-baby appearance—told InStyle.com. The look reminded us of Gwyneth Paltrow’s statement-making Tom Ford gown for this year’s Oscars. (They both even accessorized with big cuffs!) “The Oscars is the biggest nail-biter,” Paltrow had told us of this look. “I’ve learned to wear what works for my body while always taking a bit of a risk. This Tom Ford gown was stunning and modern and recalled a kind of ’60s glamour.” Do you like the cape style? Let us know!

Plus, see Sienna’s best looks ever.

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What a day for baby news! Sienna Miller and her boyfriend, actor Tom Sturridge, welcomed their first child—a daughter—on Sunday, July 8th. The little one shares a birthday with fellow Cancer tot Penelope Scotland Disick, Kourtney Kardashian and Scott Disick’s new baby. Congratulations all around!

Plus, see more celebrity moms!

Congratulations, Sienna Miller! The actress and her boyfriend Tom Sturridge are expecting their first child, the Telegraph reports. In related news, Sienna and her sister Savannah Miller recently stepped down as co-creative directors of their Twenty8Twelve clothing line, although Savannah tweeted today, “just for the record we didn’t step down at twenty8twelve because of our babies.” See more stylish moms-to-be in the gallery!

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• Celeb Mom Style
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Courtesy of 2812

It’s time for fall for Sienna Miller! The actress just released the fall 2011 lookbook for her label Tweny8Twelve—the collection she co-designs with sister Savannah Miller—and she models a few looks from the new lineup for the photos. Inspired by the ’60s, the autumn offering features soft chiffon skirts, cozy sweaters, printed silk shorts, and more items you can mix, match, and layer. Select pieces from the Twenty8Twelve collection are already on sale at Shopbop.com and Nordstrom.com, and more will hit stores and online this month. See Sienna Miller model some of her new pieces in the gallery.

MORE: Sienna’s New Pink Highlights!