Kelly Brook goes for retro glamour in a daringly low-cut dress at birthday party with dapper Thom Evans

By Sarah Bull

Last updated at 4:11 PM on 9th September 2011

She's no stranger to showing off her famous curves in sexy outfits.

But last night Kelly Brook channelled a different era as she attended her friend Karen Millen's Orient Express birthday party.

The 31-year-old star donned a daringly low-cut Roberto Cavalli gown as she hit the town with her dapper boyfriend Thom Evans.

Daring: Kelly Brook showed off her curves in a low-cut Roberto Cavalli gown as she attended Karen Millen's Orient Express themed birthday party

Kelly tweeted a picture of herself getting ready in London's Dorchester Hotel, showing off the intricate gold back of the stunning dress as she got ready to head out.

And, keen to stick to the dressing up theme as much as possible, Kelly also teamed the dress with retro waves in her hair, as well as a slick of red lipstick and a vintage style box clutch bag.

Former rugby player Thom, meanwhile, also embraced the party theme by wearing a pinstriped suit and drawing on a moustache.

Cuddling up: Kelly's boyfriend Thom Evans looked smart in his pinstriped suit

The pair smiled for photographers as they arrived for the event which took place on the British Pullman Orient Express train.

Before the party, Kelly tweeted clothing designer Millen: 'Happy Birthday!!

'Getting ready now for our Train Ride! Orient Express 1930's Glamour here we come. So excited!'

And if Kelly gets her wish, she might be dressing up a lot more in the future as, in a recent interview, she revealed she is desperate to star in a musical.

Watching her back: Kelly poses up with some other guests, also in fancy dress

Travelling in style: The party took place in the British Pullman carriage of the Orient Express (file photo)

She said: 'I love dancing. For me, if I could go back and do the dancing that would be great.

'I would love to do a musical, I'd love to do something like that - something in the West End like a stage show.'

But a return to television could also be on the cards, as Kelly also revealed her favourite ever job was working on the Big Breakfast.

She said: 'I think that show was so iconic of its time and I got to meet everybody, I got to interview everyone, and I think that's what I love about presenting is that you do get to interview people and just kind of chat to people about things.'