Pregnant Imogen Thomas shows off her naked baby bump in bikini on Marbella beach

LA: Thomas might be six months pregnant but she isn't about to put her feet up yet — as these pictures show.The former Big Brother contestant was spotted soaking up the sun in Marbella, Spain, this weekend — sporting a patterned purple bikini.

According to the Sun.co.uk report, the brunette model showed off her enormous baby bump as she topped up her tan on the beach.And while it might have been warm on the sands, the mum-to-be got a nasty shock when she headed into the freezing waters.

The 29-year-old former Miss Wales was attending a pregnancy yoga retreat at the nearby Shanti-Som Wellbeing Retreat and Spa. As well as classes designed specifically for expectant mums, the centre offers guests a healthy, all-natural diet of fruit and berries.

But despite taking a weekend away, Imogen couldn't resist checking out what was happening back in Britain - on The X Factor.

The brunette beauty is clearly a fan of judge Nicole Scherzinger, tweeting: "Nicole is sooooo beautiful."

Gorgeous Imogen, who is due in January, told The Sun back in August how she was expecting a baby with her City trader boyfriend Adam Horsley.