02/15/2012 11:26 am ET | Updated Feb 15, 2012

Sienna Miller Debuts Baby Bump At Fashion Event (PHOTO)

Though rumors have been swirling for weeks that Sienna Miller is pregnant, there was no doubt about it when the actress debuted a small baby bump at a fashion event in New York City Tuesday night.

Miller stepped out for W magazine's "Ever Changing Face of Beauty" exhibit at the Park Avenue Armory and was not afraid to show off her growing belly.

Though Miller was positively glowing in a sleek black gown, one accessory was noticeably missing. The actress, who is rumored to be engaged to the father of her baby, actor Tom Sturridge, was spotted wearing what looked like an engagement ring late last week, but her ring finger was bare at Tuesday's event.

Check out a photo of Miller's baby bump below, as well as photos of other celebrities who are expecting:

2012 Babies(CLONED)