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  Twitter: Sienna Miller
  Sienna Miller's baby bump

Sienna Miller debuted her baby bump on Valentine's Day while attending "The Ever Changing Face of Beauty," W magazine opening reception held in New York City, and is believed to be engaged.

The 30-year-old actress and model is expecting her first child with rumored fiance, Tom Sturridge, 26, and showed off her bump in a form fitting black dress while on the red carpet at the fashion event, according to Mail Online.

A number of sources revealed that the British star was spotted leaving a London club last week wearing what fans suspected was an engagement ring on her wedding ring finger.

Although Miller would not speak to the press on Tuesday night, friends and family of the pair recently spoke out about her exciting baby news.

"We're not surprised by the news of the pregnancy. They just spent the holidays in Paris together after they announced the news in London," a source told Us Weekly magazine.

Friends are really happy with her relationship with Tom. "He's younger, yes, but he's mature and he's a good guy," another source said.

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While Miller's relationship with Sturridge appears to be serious, this is not the first time that she has been engaged. In Dec 2004, the mother to be became engaged to on-again, off-again boyfriend actor Jude Law, despite their rocky history.

After numerous relationship woes, the couple split for good in 2011 shortly before Miller began dating Sturridge. Despite sporting a ring on her wedding finger, Miller's former stepmother, Kelly Hoppen, recently told U.K.'s the Evening Standard that while she is definitely expecting a child there is no truth to the engagement rumors.

"Sienna is definitely not engaged or getting married… she is pregnant," Hoppen said.

Fans continue to post congratulatory messages to Miller via Twitter, convinced that she is in fact both pregnant and engaged.