Stag dos are traditionally a time for the groom to spend time with his male friends before he makes that final commitment to his partner.

Women are usually prohibited, unless of course she is providing the night's 'entertainment' - however, Natalie Imbruglia made an exception to this rule when she joined in the festivities at David Walliams' stag party last night.

The Australian actress, 35, arrived for dinner with the funnyman, 38, and a group of his male celeb friends at the Nobu London restaurant on Park Lane, London before they headed down to the Met Bar for a private party.

Unusual guest: David Walliams invited good friend Natalie Imbruglia to his stag party, which began at the Nobu restaurant in Mayfair, London

Flying solo: Natalie was the only female guest at David's stag do

She looked great in a smart black coat, with white stitched detailing and a sparkling pair of black Louboutin pumps.

Natalie joined a cast of celebrity men which included David's Little Britain partner Matt Lucas, Vernon Kay, Elton John's partner David Furnish, comedian Alan Carr, James Corden, Steve Coogan and, bizarrely, boxer Chris Eubank.

The gang partied the night away at the Met Bar, where they boogied to the sounds of the eighties thanks to Five Live and LBC DJ Edward Adoo, who is the bar's resident music man.

Comedy contingent: Matt Lucas and Steve Coogan were amongst the guests at David Walliams' stag do

A source at the bar told the MailOnline: 'Everyone was vibing and drinking, having a great time. Vernon Kay was throwing some shapes on the dancefloor, as they all were. James Corden, Rob Brydon and Alan Carr did a turn on the karaoke too.

'At one point the DJ knowingly played Billy Idol's White Wedding, which went down a storm. It was certainly a jovial occasion.'

Miss Imbruglia has been friends with David Walliams, 38, for three years and the two were pictured on a couple of dates last year, although she made it clear they would never be anything more than friends.

Party time: David Furnish and Alan Carr head to the Met Bar to continue the festivities

In February 2009, Walliams told Radio 4 that Natalie was his ideal woman.

He said: ‘There's a couple of girls I know and they are amazing, so much fun, and they're so amusing and naughty and beautiful.

‘One's Kate Beckinsale, that I've known for a really long time, since before she was well known, and Natalie Imbruglia as well.

No strippers: Vernon Kay and Chris Eubank joined in the fun and games at David Walliams' party

‘When I'm with them I turn to jelly because they're so exciting to be with, but neither of them would ever go out with me, so I can't.

'Natalie always makes it very clear that we could never be anything more than friends.'

Walliams proposed to fiancee Lara Stone, a fashion model who is 13 years his junior, in January after calling her parents to get their blessing.

Celebrity friends: Dale Winton and David Baddiel will also be attending Walliams' wedding, which takes place tomorrow at Claridge's in London

Dutch born Lara, 25, began dating Walliams in September last year, and the pair went to great lengths to keep their relationship a secret.

The couple are said to have been spending nights together watching TV and going out for secret dinners around London, instead of hanging out at the capital's usual celebrity haunts.

A friend of the pair said the actor phoned the model's parents in Holland to ask for their blessing before popping the question.

Home James! David Walliams and TV funnyman James Corden leave the Met Bar

He also bought her a vintage engagement ring in LA.

They are due to marry tomorrow at Claridge's Hotel in Mayfair, at a lavish ceremony which will be full of celebrity guests from the worlds of music, television and fashion.

It has been reported that Lara has chosen Riccardo Tisci to design her wedding gown. The leading fashion designer helped launch her career by giving her a major role in one of his catwalk shows.

Whirlwind romance: David got engaged to Lara Stone in January after just four months together - they are due to marry tomorrow