Sienna Miller debuts baby bump

Sienna Miller has shown off her baby bump on the red carpet.

The 30-year-old actress and fashion designer began dating actor Tom Sturridge last year and confirmed in January that she was expecting her first child.

Sienna attended The Ever Changing Face of Beauty do at New York's Park Avenue Armory hotel wearing a floor-length, tight-fitting, high-necked black gown which showed off her growing bump for the first time.

She joined guests including Cate Blanchett, Olivia Palermo and Evan Rachel Wood at the unveiling of a video installation by fashion photographer Solve Sundsbo.

The mum-to-be is rumoured to be engaged to The Boat That Rocked star Tom, but she was not wearing a ring on her engagement finger at the event.

The actress said in an interview last year: "I can't wait to be seen as a woman. But I know I probably have to contribute to that with behaviour."

She added: "I think, if you put a camera in anyone's life and document it daily from the age of 21 to 27, there are going to be things that aren't always pretty. Now, I'm much more calm. It feels like a new, more serious decade."

It was announced last month that she and her sister Savannah have stepped down as co-creative directors of their fashion label Twenty8Twelve to focus on other projects, which for Sienna includes becoming a mum.

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Sienna Miller debuts baby bump