Ryan Dunn

By DAILY MAIL REPORTER

Lady in red: Isla Fisher shows off her post-baby curves in a little red dress and velvet jacket at the London premiere of Burke And Hare

Isla Fisher made a triumphant return to the spotlight in a little red dress tonight as she made her first public appearance since becoming a second time mother.

The Australian-raised actress, 34, showed off her post-baby curves in a figure-hugging Dolce & Gabbana lace mini as she attended the London premiere of her new film Burke And Hare.

The 34-year-old, who married comedian Sacha Baron Cohen in March, joined co-stars Simon Pegg, Andy Serkin and Jessica Hynes at the Chelsea screening of the British black comedy.

Although she rapidly slimmed down after the birth of her first child Olive three years ago, Isla appears to be embracing her curves this time round as she displayed her ample cleavage in the tight dress.

It was reported last month that Fisher and Cohen, who have been together for eight years, welcomed a second child in late summer, but the name, sex or date of birth of the child has yet to be revealed.

While the former Home & Away actress remained coy over the details of the Cohen family's new addition, she did admit tonight she was suffering from bad morning sickness while shooting the film in Scotland earlier this year.

Changing shape: A pregnant Isla in May this year (left) and looking slim a few weeks after giving birth to first child Olive in November 2007 (right)

Fisher plays Helen M'Dougal, the love interest for Pegg's character William Burke, one half of serial killing duo Burke & Hare, along with Serkis as William Hare.

The actress revealed some of her co-stars assumed she had an eating disorder because of her morning sickness.

She said: 'I was actually pregnant during the shooting and I had severe morning sickness and I didn’t eat anything and I just vomited all the time.

'Simon Pegg is the least observant actor in the planet because he didn’t notice. I think he presumed I was just a typical Hollywood bulimic actress rather than the fact that I was severely sick.'

What's black, white and red... Isla joins her on-screen love interest Simon Pegg (right) and co-star Andy Serkis at the Chelsea Cinema on the King's Road

Pegg conceded he didn't realise she was pregnant: 'I didn't know what was going on. She didn't look pregnant until the last minute. I saw her a couple of months later and she was like a balloon. None of us knew, not even John knew. She hid it well.'

The film, directed by John Landis, who was responsible for Michael Jackson's Thriller video, also stars Pegg's Spaced co-star Jessica Hynes as Hare's wife and Tom Wilkinson as the killers' 'customer' Dr Knox.

The real-life Burke and Hare, who hailed from Ireland, were responsible for the deaths of at least 17 people from 1827 until 1828.

Glamming up: Jessica Hynes wore a vintage-style orange gown (left) while co-star Pollyanna McIntosh were for a Gothic look in a black gown and coat

After murdering their victims, the pair then went on to sell the bodies to Dr Robert Knox, who dissected them in his anatomy classes at Barclay's anatomy school in Surgeon's Square.

The pair were eventually caught when one of their lodgers tipped off the police after finding the body of their last victim, Marjory Campbell Docherty, under her bed.

As the evidence against them was weak, Hare was offered immunity from prosecution if he testified against Burke - which he did - so the latter was found guilty and hanged in January 1829.

After serving a short time in prison, Hare was released in February 1829 and left Edinburgh, never to be seen again.

Burke and Hare is due to release in UK cinemas on Octber 29.