KELLY Rowland's expensive new boobs were in millions of X Factor viewers' faces despite a so-called tough Ofcom ruling outlawing 'sexualised clothing'.

The American singer wore an slashed to the waist sheer black dress which guaranteed her curves were never far from the screen.

But the shock frock will raise eyebrows as well as male pulses because TV watchdog Ofcom has warned the X Factor and other shows broadcast before the watershed of 9pm that appropriate dress and behaviour should be observed.

The ruling specifically referred to breasts saying “Ofcom would not expect to see any images that failed to adequately cover their bodies, in particular breasts.”

The ruling came after 4,500 complaints over Rihanna's gyrating in a bra and pants and Christina Aguilera's scantily-clad dancers' stripper routines during the live X Factor final last December.

The Ofcom statement read: “In entertainment and talent show genres particular areas of concern include the sexualised clothing and dance routines of performers and guest artists.

“Family shows…attract a significant child audience and therefore broadcasters should ensure that the content is suitable for family viewing throughout the programme.”