Mischa Barton leaves the Hollywood smiling to Melbourne Cup winner Brew

Horsing around! American star Mischa Barton leaves the Hollywood smiling to Melbourne Cup winner Brew

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UPDATED:

10:07 GMT, 6 November 2012

She is a Hollywood star so is doubtless familiar with the old showbiz adage: 'Never work with children or animals.'

But like a true pro, The O.C. actress Mischa Barton took a little horseplay in her stride as she posed with the Melbourne Cup and its 2000 winner Brew in Australia on Tuesday.

Wearing a silver brocade dress with a chunky, metallic statement necklace and a black pillbox hat adorned with a large black silk rose, Mischa, 26, didn't bat an eye even as the thoroughbred race horse whinnied and showed his teeth.

Straight from the horses mouth: Mischa Barton meets Melbourne Cup 2000 Winner Brew

Straight from the horses mouth: Mischa Barton meets Melbourne Cup 2000 Winner Brew

She's a pro: Mischa Barton keep the frisky horse in hand

She's a pro: Mischa Barton keep the frisky horse in hand

Quick change: Mischa Barton changed from a draped mauve number into a far more fashionable silver frock

Quick change: Mischa Barton changed from a draped mauve number into a far more fashionable silver frock000 Winner 'Brew',

Quick change: Mischa Barton changed from a draped burgundy number into a far more fashionable silver frock

The British-born beauty attended the
star-studded prestigious race, as a guest of the Victoria Racing Club
and Emirates Airlines along with a gaggle of Antipodean celebs and
Prince Charles and the Duchess of Cornwall.

Earlier in the day she was seen wearing a much less flattering burgundy dress, with draping reminiscent of the airline stewardesses uniforms along with a Philip Treacy fascinator.

'It's
more laid back than I thought it would be,' Barton told reporters.
'England is quite a big production.This experience has been generally
pretty laid back … everyone wants to have fun and have a nice day.'

Social butterfly: The star was working the crowd and mingling with a whole host of attendees as she enjoyed her day out at the races

Social butterfly: The star was working the crowd and mingling with a whole host of attendees as she enjoyed her day out at the races

A head for hats: Mischa showed off her style credentials in an unusual floral and swirl detail fascinator

A head for hats: Mischa showed off her style credentials in an unusual floral and swirl detail fascinator

A head for hats: Mischa showed off her style credentials in an unusual floral and swirl detail fascinator

Share girls!: Mischa Barton and Ashley Madekwe hold the Melbourne Cup aloft at the Emirates marquee at the Melbourne Cup at Flemington Racecourse

Share girls!: Mischa Barton and Ashley Madekwe hold the Melbourne Cup aloft at the Emirates marquee at the Melbourne Cup at Flemington Racecourse

The Los Angeles based actress was later joined by Revenge star Ashley Madekwe who
bemoaned the fact she was to fly back to the US tomorrow, as she will
miss the glamorous Oaks Day fashion on Thursday, where
Sex and the City's Kim Cattrall will be in attendance.

'I know, from what I have been told, racing is secondary,' London born Madekwe told The West Australian. 'It's about what the women are wearing, big hats, people watching.'

Winning: Revenge star Ashley Madekwe looked chic in a mint green peplum tweed skirt and a cream halter top as she posed with the Melbourne Cup

Winning: Revenge star Ashley Madekwe looked chic in a mint green peplum tweed skirt and a cream halter top as she posed with the Melbourne Cup

Fun in the sun: Ashley and Mischa seemed to be having a whale of a time as they enjoyed a day at the races

Fun in the sun: Ashley and Mischa seemed to be having a whale of a time as they enjoyed a day at the races

Aussie stars: Singer Delta Goodrem and actress Rose /11/06/article-0-15DE0D58000005DC-583_306x709.jpg

Centre of attention: Rose chats to the assembled media pack at the event

Jetting in: Real Housewives of Beverly Hills star Taylor Armstrong attended the event, flying in from her Los Angeles base

Jetting in: Real Housewives of Beverly Hills star Taylor Armstrong attended the event, flying in from her Los Angeles base

Jetting in: Real Housewives of Beverly Hills star Taylor Armstrong attended the event, flying in from her Los Angeles base

A Royal occasion: Camilla Duchess of Cornwall and Prince Charles, Prince of Wales share a joke as they stand by the racecourse

A Royal occasion: Camilla Duchess of Cornwall and Prince Charles, Prince of Wales share a joke as they stand by the racecourse

'It's my first time and I'm thrilled
to be here,' she said. 'My father is a real punter and we're here (my
father and sister) and we're having a bet.'

The fashion blooper of the event definitely went to Neighbours actress-turned-singer Delta Goodrem.

The
Born to Try singer, 27, looked more appropriately dressed for a child's
birthday party in a bright pink tulle dress, matched with a pair of
unflattering taupe ballet flats and a crown of roses on her head.

Lovely ladies: Australian beauty queen Jennifer Hawkins, left, poses with model Kris Smith

Lovely ladies: Australian beauty queen Jennifer Hawkins, left, poses with model Kris Smith

Crafty cigarette: Former Australian cricketer Shane Warne smokes while mingling with guests

Crafty cigarette: Former Australian cricketer Shane Warne smokes while mingling with guests

Be my date: Former Boyzone singer Ronan Keating brought along his girlfriend Storm Uechtritz, who stood out in a bright orange dress

Be my date: Former Boyzone singer Ronan Keating brought along his girlfriend Storm Uechtritz, who stood out in a bright orange dress