Following the initial festival rumours, the model took to Instagram to write, "It wasn't me" with a shrug emoji.
Whether she was flat out denying that she was kissing her ex, or having a bit of fun with some Shaggy lyrics, who knows, but less than a month later the pair has been spotted together again at Cannes Film Festival.
Blurry footage taken inside a Cannes party shows The Weeknd greeting Bella and her friends, before putting his arm around his ex.
They're then sighted again sitting closely in a VIP area, before Bella is seen dancing on stage with friends.
The couple broke up in November 2016 and The Weeknd famously went on to date Selena Gomez until October 2017 when they split.
Speaking of the split, Bella said it was her first public break up and it was hard.
“As an outsider, you might think I handled it so well, but it’s always in your heart, and you always feel it very heavily,” she told Teen Vogue. “It’ll be hard for a while. Love hurts, but you pull through.”
“I’ll always respect him, and I’ll always love him. Sometimes you want to be sad about it or handle it differently, but at the end of the day, you never want to burn a bridge that you’ve fought so hard to build.”