October 11, 2012 10:00 AM

Johns PKI/Splash News Online; Jason Kempin/Getty

Sienna Miller sure knows how to make an entrance.

Just three months after welcoming her daughter Marlowe Ottoline in July, the actress stylishly stepped out to promote The Girl at the Hamptons International Film Festival last weekend.

And although it’s her first post-baby event since becoming a mom, she proved she can still effortlessly turn heads.

“To be honest it’s kind of nice to put on a dress,” Miller, who slipped into an Alessandra Rich cream cape-style floor-length frock paired with a red Charlotte Olympia lips clutch for the premiere before donning a classy button-down shirt, black cardigan and Sea NY Printed Trousers for the festival’s brunch, told InStyle.

“I’ve been in baggy jeans and baggy t-shirts and breastfeeding — it’s hard to have any semblance of glamour when you’re in the middle of new motherhood.”

But while her chic return to work may have caused a lot of fanfare, Miller’s main focus is still her new baby girl. “I’m just so focused on my daughter that I don’t care as much — which is great.”

— Anya Leon

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