The 'Never Tear Us Apart' singer is said to have raised her middle fingers at a journalist on the red carpet outside London's O2 Arena on Wednesday (February 20) after realising they were waiting to speak to the boyband.
"You wanted One Direction and they snubbed you," Entertainmentwise quotes Faith as saying to the unidentified reporter. "I'm sorry I'm not One Direction people."
The website claims it was at this point that Faith swore directly at the camera, before adding: "I'm talking to someone who didn't want to talk to me over them and I'm still here."
Faith was nominated for 'Best Female' and 'Best British Album' (Fall to Grace) at the Brits, but lost out to Emeli Sandé and her debut LP Our Version of Events. One Direction, meanwhile, picked up the 'Global Success' award.
The 'One Way Or Another (Teenage Kicks)' band appear to have also incurred the wrath of fellow Brits nominees Mumford & Sons, who apparently snubbed them backstage, and Jake Bugg, who declared that the fivesome "must know they're terrible".
One Direction stars Niall Horan and Louis Tomlinson have since responded to Bugg's comments on Twitter, with the latter asking "Do you think slagging off boybands makes you more indie?"
Brit Awards 2013 winners - photo gallery: