According to The Mirror, TV watchdogs Ofcom have received over 150 complaints 'relating to performance, costume and lyrics', after Gaga writhed around on stage in a nude-coloured bra and pants to new songs 'Venus' and 'Do What U Want' on Sunday night's results show.
A spokesperson told the paper: “We will assess all the complaints received on this issue before deciding whether to investigate.”
However, a spokesperson for the channel has defended Gaga's performance, telling the paper: “We do not believe Lady Gaga’s performance was inappropriate for the family audience of the show, which has an established tradition of performances from the biggest music stars. She’s well known for her highly individual style.”
It isn't the first time 'The X Factor' has received complaints over it's racy guest performers.
When Rihanna appeared on the 2010 final along with Christina Aguilera, their raunchy performances racked up over 1,000 complaints to Ofcom, leading to new guidelines that stars should cover up on TV before the 9pm watershed.
Watch Lady Gaga's 'X Factor' performance below...