The Love Island presenter, 39, who has been single since ending her whirlwind romance with Andrew Brady in December, cuddled up to the 24-year-old professional after the glitzy bash at London’s O2 Arena.
Flack and Pritchard reportedly enjoyed a night together in a cosy corner of the lavish party, before allegedly heading to a taxi rank in the early hours of Wednesday morning.
In blurred photos obtained by The Mirror, Flack was draped over the professional dancer.
A source told The Sun that the pair were the “talk of the party” and that they “didn’t seem to care who was looking”.
“AJ was blatantly touching her bum throughout the night and Caroline cuddled up to him as they walked through the bar,” they said.
"They had plenty of chemistry and were acting like a proper couple.”
Standard Online has contacted representatives for Flack and Pritchard for comment.
Flack called time on her romance with Celebrity Big Brother star Brady for good late last year, after being on and off for several months following their so-called split.
Brady later revealed that he was moving to Australia to start again after “becoming paranoid about what press write about him” and their rocky relationship.
While the pair had a 10 year age difference, Flack has shown that she isn’t fazed by large age gaps after dating One Direction’s Harry Styles when he was 17 and she was 31.
Pritchard, who hit the headlines at the beginning of the year after being attacked on a night out over Christmas, has often remained tight-lipped on his love life but has been previously linked to former Strictly partner Mollie King.
He is currently on the Strictly Come Dancing Live Tour with Paralympian Lauren Steadman, with who he reached the semi-final of the 2018 series.
Meanwhile, fans were left wondering if Flack had had her AB tattoo removed as she showed off two love heart inkings on her wrist, where the initial tribute could previously be seen.