Sienna Miller shows off baby bump Actress Sienna Miller attends The Ever Changing Face of Beauty reception at the Park Avenue Armory in New York on Tuesday. An ultra-glam mom-to-be deserves to debut her new silhouette in the most ultra-glam of places: on the red carpet. That's just what Sienna Miller did when she stepped out in New York City Tuesday night to attend the Fashion Week-themed soiree The Ever Changing Face of Beauty. MORE: Check Out Sienna Miller's Gorgeous Engagement Ring! Miller stunned onlookers in a floor-grazing black gown that hugged and flattered her growing figure. Two peekaboo slits flashed some leg, and she kept the look simple and minimalist with a clean upswept 'do, a compact gold clutch and understated gold accessories. The one glaring accessory that seemed to be missing? The supposed engagement ring that she was photographed wearing last week. Reports are swirling that the "G.I. Joe: The Rise of Cobra" actress and baby daddy Tom Sturridge got engaged during a post-Christmas trip to Paris. MORE: Sienna Miller Is Pregnant...and Engaged?! The actress is reportedly due in July, and news of her pregnancy broke last month when her sister, Savannah, inadvertently tweeted the news. Forget secret sources: We're going straight to Savannah's Twitter feed for all the dish on Sienna's pregnancy, now that the actress has publicly debuted her baby-bumpin' figure!