Sienna Miller revealed her growing baby bump at the W magazine’s cocktail reception on Tuesday (February 14) at the Park Avenue Armory in New York City.

Looking gorgeous in a slimming Boss Black dress, Miller is glowing.   She is expecting her first child with Tom Sturridge.

Rumors of the couple being engaged began over the weekend when Sienna was spotted in London with what appeared to be an engagement ring.   She was not wearing a ring on her engagement finger at the cocktail reception.

Is she engaged or isn’t sure – that is the question?  One thing we do know…she is pregnant and showing.