(Getty Images)

Sienna Miller has debuted her growing baby bump in stunning fashion at the New York Fashion Week event: The Ever Changing Face Of Beauty.

Miller stepped out in a figure hugging black gown and sky high platform pumps. The only thing missing was that ROCK she was photographed wearing earlier in the week! It's a bit late for secrets lady....

The bundle of joy is reportedly due in June, according to Sienna's sister Savannah, who unwittingly tweeted the news!

Do you think Sienna is really engaged?