REBECCA continues to prove that she may not be the sharpest tool in the Big Brother house - by guessing there were 12 weeks in a year.

REBECCA continues to prove that she may not be the sharpest tool in the Big Brother house - by guessing there were 12 weeks in a year.

The nursery nurse followed up her hotpant-clad ballerina dance with yet another embarrassing outburst of brainlessness.

The cringe worthy conversation started as the 21-year-old discussed “boring” Rachel with fellow heavenly housemates Rex and Luke.

When chef Rex revealed that teacher Rachel had failed to identify both the number of days and weeks in a year, Luke was left incredulous.

But worse was to come - Bex said she didn't know either, prompting Luke to ask her to guess.

“Twelve?” she replied, sparking more gasps and cries of disbelief from close friend Luke.

“Twenty four?” she added. “I honestly don't know!”

The conversation will challenge for the most shamefully stupid line in Big Brother history, which is probably currently held by Jade Goody who, among other foolish outbursts in her time in the house, once said that she thought East Anglia was abroad.