We've watched her perform this song on a variety of different shows the past month or so, and the presentation here was very different than many of them.
One viewer penned on Twitter: "How is that Lady Gaga?".
Another added: 'Are we all not going to say anything about lady gaga's face?
Following her performance, fans took to the social media site to question whether Gaga has had a nose job or other surgery to alter her features.
She tweeted following the show: "I love my United Kingdom fans so much!"
Lady Gaga in 2013
Lady Gaga recently performed that Victoria's Secret Fashion Show where she wore a black bejeweled hat with 45,700 Swarovski crystals and cost $1 million.
Both BGT and X Factor have aired their live shows from Fountain since their first series in 2007 and 2004 respectively while the studios themselves date all the way back to the 1920s. She is constantly dancing on stage and performing elaborate dance routines-also a great way to burn additional calories.
"Lady Gaga has definitely had surgery, doesn't even look like her", another Twitter user claimed.
This weekend marks the end of an era with the X Factor studio being demolished and totally closed down. Her "unrecognizable" face aside, GaGa delivered a dramatic performance with a smoky backdrop.
Gaga was in Paris for the Victoria's Secret Fashion Show, and it appears she really connected with the show's lingerie models, explaining, "These girls show tremendous vulnerability and strength entertaining the world in this show".
Carrier, Fresh Off Trump Talks, Increases Prices on Higher Costs
Donald Trump had a stern warning to companies thinking of leaving the United States during his Sunday morning Twitter tirade. The arrangement seemed to be the product of not just sticks, but carrots as well ― $7 million in tax breaks over 10 years .