Pregnant Sienna Miller shares romantic lunch with rumoured fianc Tom Sturridge

Enjoy it while it lasts! Sienna Miller shares romantic lunch with rumoured fianc Tom Sturridge as they look forward to baby

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UPDATED:

15:24 GMT, 31 March 2012

They have a baby on the way, so Sienna Miller and Tom Sturridge soon won't be able to enjoy a cosy meal at a posh restaurant.

But until the little girl or boy arrives, the actors are obviously making the most of their spare time.

The couple, who are thought to be engaged, were spotted at a cafe in Soho today, sharing an intimate lunch.

Chilling out: Pregnant Sienna Miller was spotted having lunch with boyfriend Tom Sturridge and friends in Soho, London today

Chilling out: Pregnant Sienna Miller was spotted having lunch with boyfriend Tom Sturridge and friends in Soho, London today

Sienna did maternity chic well, donning a denim tunic over black leggings with black boots.

The 30-year-old added a large grey jacket to the ensemble and large round glasses.

The star, who is in the second trimester of her pregnancy, also wore a diamond sparkler on her engagement finger.

Maternity chic: The actress wore a denim tunic, big grey jacket and leggings

Maternity chic: The actress wore a denim tunic, big grey jacket and leggings

Growing belly: The 30-year-old, who is in her second trimester, showed off a hint of a baby bump as she got up

Growing belly: The 30-year-old, who is in her second trimester, showed off a hint of a baby bump as she got up

Her bohemian beau, 26, opted for a black beanie with a long denim jacket.

Sienna recently spoke to British Vogue about her pregnancy cravings.

She said: 'I'm feeling fine. It's all progressing nicely and it's very
exciting. It's nice to start a new decade.

Hey there! The actress also spoke to another patron sitting beside the couple

Hey there! The actress also spoke to another patron sitting beside the couple

See you later! The star says goodbye to the man before heading off with Tom

See you later! The star says goodbye to the man before heading off with Tom

'I feel very grounded, more than ever – it's a wonderful feeling. But all of a sudden, I've started to get cravings. I usually don't have a sweet tooth but these tarts I could eat all day long!'

However,
Sienna added that while she is looking forward to welcoming her first
child into the world, she doesn't want to talk too much about the
pregnancy because she wants to keep her life as private as possible.

She
added: 'I'm in my second trimester, so I'm I-can-talk-about-it
pregnant, even though I'm under strict instructions not to say anything
as it would completely defeat the point of everything I've tried to
achieve in the last eight years.'

Wacky sense of style: Tom's denim jacket looked similar to a dressing gown

Wacky sense of style: Tom's denim jacket looked similar to a dressing gown

The
G.I. Joe: Rise of Cobra actress also spoke to the magazine about
turning 30, adding that she didn't react to the landmark birthday as she
thought she would.

She
said: 'I didn’t have the freak-out which I thought I would have. But
maybe it’s because I’m the youngest of all my friends – so that lessened
the blow. It’s nice to start a new decade.'

Sienna
and Tom, most famous for his role in The Boat That Rocked, began dating
in mid 2011 shortly after her split from fianc Jude Law.