Pregnant Sienna Miller shows no signs of slowing down at Robert Pattinson"s birthday party


Not putting her feet up just yet! Pregnant Sienna Miller shows no signs of slowing down as she attends R-Patz's birthday party

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UPDATED:

11:01 GMT, 14 May 2012

She might be due to give birth in just a couple of months time but Sienna Miller is not ready to sit back and relax just yet.

And once a party girl, always a party, even if no alcohol and an early night was on the cards.

The actress was snapped leaving Claridge's last night after attending a dinner to celebrate Robert Pattinson's 26th birthday.

No grey day for her! Pregnant Sienna Miller leaves a birthday dinner in London last night looking blooming in her jumper dress

No grey day for her! Pregnant Sienna Miller leaves a birthday dinner in London last night looking blooming in her jumper dress

And while some celebrities will go for comfort over style when it comes to be being pregnant, especially as the big day approaches, Sienna managed to combine the two.

She looked chic in her grey jumper dress, which showed off her burgeoning baby bump and teamed the dress with peep-toed ankle boots, a green and brown belt and a huge red bag.

She also sported her recently dyed hair, which is now a shade of dirty blonde.

But no doubt she had it done professionally this time after she admitted that a self-dye job had gone wrong – and she had to turn to a condiment for help.

Chic and comfortable: Sienna opted for a stretchy dress that showed off her bump

Chic and comfortable: Sienna opted for a stretchy dress that showed off her bump

Chic and comfortable: Sienna opted for a stretchy dress that showed off her bump

Designated driver: Not being able to drink in her condition meant that Sienna was able to drive home and got her keys out to unlock her car as she left the building

Designated driver: Not being able to drink in her condition meant that Sienna was able to drive home and got her keys out to unlock her car as she left the building

Speaking to Marie Claire, she said: 'I once used henna to dye my hair brown for an audition, thinking I was being clever as it's all natural.

'Little did I know it was the worst thing I could have done as it coats the follicles so that nothing else can penetrate so I ended up having to put ketchup in it for about a year to get rid of the green tinge.'

Some may think it odd that she would be invited to a birthday dinner for the Twilight star when they have never made a film together or even considered to be friends.

But Sienna's fianc Tom Sturridge is best friends with R-Patz and he avoided the cameras as he met her inside the hotel.

Screaming girls: Robert Pattinson was greeted by a bunch of delighted Twi-hards as he arrived for his dinner

Screaming girls: Robert Pattinson was greeted by a bunch of delighted Twi-hards as he arrived for his dinner

It's my party and I'll scruff if I want to: Despite the lovely central London venue, R-Patz didn't make much of an effort in his jeans, shirt and baseball cap

It's my party and I'll scruff if I want to: Despite the lovely central London venue, R-Patz didn't make much of an effort in his jeans, shirt and baseball cap

It's my party and I'll scruff if I want to: Despite the lovely central London venue, R-Patz didn't make much of an effort in his jeans, shirt and baseball cap

Pattinson's girlfriend Kristen Stewart is also in the capital promoting her new movie Snow White and the Huntsmen.

But she was nowhere to be seen although the notoriously camera-shy actress may have slipped in the back to avoid the flashbulbs.

It was the last chance for Pattinson to catch-up with his friends before he heads off the Cannes for the premiere of his new film Cosmopolis.

Directed by David Cronenberg, Robert plays billionaire Eric Parker who journeys across New York.

Not-so-random guest: Sienna's fianc Tom Sturridge, seen here with her in Italy earlier this month, is R-Patz's best friend

Not-so-random guest: Sienna's fianc Tom Sturridge, seen here with her in Italy earlier this month, is R-Patz's best friend