Blooming Imogen Thomas debuts her baby bumpWENN

After announcing her pregnancy over the weekend, Big Brother star Imogen Thomas wasted no time in pottering around in front of the paps in a tight T-shirt today, proudly showing off her rounded tum.

The Welsh glamour girl, 29, is 12 weeks pregnant. This is her first baby with her city trader boyfriend Adam Horsley.

Big Brother's big belly: Blooming Imogen Thomas debuts her baby bumpWENN

She stepped out in London with a printed t-shirt stretching over her stomach, and played up to the cameras by gently rubbing her rounded-up tummy, wearing a big grin on her face.

Imogen announced her happy news to the Sun on Sunday, saying: "I never thought I would find happiness again but finding love and then falling pregnant has transformed my life.

"I'm convinced I am having a girl because I can't stop being sick and eating potatoes of all descriptions, my mum had the same symptoms with me.

Big Brother's big belly: Blooming Imogen Thomas debuts her baby bumpWENN

"Adam has started getting excited now I'm showing - he keeps touching the bump. It is amazing to think our baby is inside there."

Something tells us she's going to get some mileage out of her nine months...

See the other famous faces expecting babies this year with our gallery below.