Victoria Beckham has sparked a pregnancy riddle after reportedly talking about her "strange food fads".

The fashion designer and her husband David Beckham have four children, Brooklyn, Romeo, Cruz and Harper. It's been suggested Victoria might be pregnant again after she displayed some unusual behaviour while in the UK this year.

"When she was last in London, Victoria was dropping hints that her current unruly brood might become even more unruly next year. She was also talking about having some strange food fads and she didn't drink at all, not even to celebrate after performing at the Olympics," an insider told Heat magazine. "Her behaviour led to some of her friends asking outright if she was pregnant and she just smiled in response."

It's also been claimed that Victoria has put on some weight and she has been spotted in baggier clothing than usual recently.

David has been open about his desire to have more children, with Victoria saying she would never rule out the possibility of adding to her brood.

"Victoria is desperate for one more baby before she's 40 [in April 2014] and David was quick to agree," the source explained.

"She and David are always at their absolute happiest when she's pregnant and they're so in love right now. Even her family have said it would be no surprise at all if Victoria was expecting again."