Rihanna and Christina Aguilera are under fire for their racey performances on the finale of British talent search 'The X Factor.' The performances took place on Dec. 11, the night before Matt Cardle was crowned the winner, but since then the British broadcasting regulator Ofcom and the show's network, ITV, have received almost 4500 complaints, prompting an investigation into the show's finale.

Both females wore lingerie-like outfits, but provocatively shook their hips a little too much for the nearly 20 million viewers watching. Although the finale aired at the 7-9PM slot, before what the U.K. calls the "watershed" hour or 9PM outset for adult content, ITV and the show face the possibility of being slapped with fines, if found guilty for breaking section 1.3 of the British broadcasting code. The rule charges that "children must be protected by appropriate scheduling from material that is unsuitable for them."

Rihanna's performance recalled Britney Spears' 'I'm a Slave 4U' snake spectacle at the 2001 MTV Video Music Awards. The Bajan beauty took off a striped tunic mid-song and showed off her curves to the oh-na-nas of her current hit single 'What's My Name?' Aguilera and her dancers, on the other hand, looked more like strippers during her performance of 'Express,' but it was in a similar vein of Xtina's winter blockbuster 'Burlesque,' off which the song is featured. Check out the videos below and decide for yourself if U.K. viewers are overreacting ... or not.