The M&S television commercials were filmed before Myleene publicly confirmed her pregnancy.

She stars in them alongside Erin O’Connor, Lizzy Jagger, Twiggy and Laura Bailey.

Commenting on the new campaign, Myleene said: "Working with the other girls was like your first day at school. At first I was a little bit nervous. Who wouldn’t be standing next to Twiggy and Erin."

An M&S spokesman could not say whether Klass would model maternity wear for the chain.

The classically trained musician first hit the headlines as part of Hear’Say when the band won TV reality show Popstars in 2001.

More recently she appeared in the jungle game show I’m A Celebrity ... Get Me Out of Here!

During today’s photoshoot at an M&S store on London’s Oxford Street Klass wore an M&S Limited Collection dress which retails for £49.50.

Klass ’ecstatic’ at pregnancy news - April 2 2007
Model and singer Myleene Klass is expecting her first child, it has been announced.

The musician, who found fame with reality TV band Hear’Say, is "ecstatically happy" at the news, her spokesman said.

Klass, 28, will now postpone her November wedding to fiance Graham Quinn, 30, until next year.

In a statement, she said: "Graham and I are ecstatically happy. We’ve always wanted a family of our own.

"I am truly delighted and know Graham will make a fantastic father."

Her spokesman added: "They are engaged but not going to get married this year now, probably next year. They are going to have the baby first."

The classically trained singer first hit the headlines as part of band Hear’Say when the band won TV reality show Popstars in 2001.

More recently she appeared in the jungle game show I’m A Celebrity ... Get Me Out of Here! in which she came second.

She has also hosted various TV and radio shows, while last month she starred in a new Marks & Spencer advertising campaign.

Klass began her relationship with Quinn in 2001 when he worked as a bodyguard for Hear’Say.

Klass to present new CNN film show - Mar 5 2007
I’m a Celebrity star Myleene Klass is to present CNN’s first film show, the international news network has said.

The classically-trained former Hear’Say singer will front The Screening Room, which premieres on the channel on Friday March 30.

Producers say the half-hour monthly show will feature interviews, reports from film festivals and red-carpet events for movies ranging from blockbusters to independent films and documentaries.

Klass, who has had presenting roles on a number of programmes including the X-Factor and ITV music show CD:UK, as well as winning I’m A Celebrity Get Me Out Of Here in 2005, said she was excited about the new programme.

"I’m overwhelmed to be part of something so groundbreaking for CNN - the network’s first movie show.

"CNN has kudos and gravitas all over the world, and that strong brand will ensure that I will get the very best interviews.

"One thing is for sure, if I wasn’t part of The Screening Room, I’d be glued to my seat watching it."

CNN International’s senior vice president, Rena Golden, said: "Every month The Screening Room will go to Hollywood and beyond to bring the most compelling and dynamic aspects of the film world to CNN’s vast international audience.