AceShowbiz - The Weeknd and Bella Hadid's relationship is apparently back on. The pair spark rumors that they have given their romance another chance after the Canadian singer was spotted celebrating the Victoria's Secret model's birthday at Le Chalet, L'Avenue at Saks' lower level cocktail lounge in New York on Thursday night, October 10.

Multiple sources claimed that The Weeknd and Bella looked like they "were back together" during the birthday bash, with an onlooker telling E! News that the Grammy winner "was with her the entire night" and that they took tequila shots at the bar. "They were very flirty with each other throughout the night, and when he was feeding her macaroons, it was apparent there were sparks," another eyewitness shared, while a third source said The Weeknd also serenaded Bella with a group of friends during the bash.

"You could tell that they were definitely in love and they both looked very happy being around each other," so the first onlooker noted, adding that the pair "left together to go back to the apartment they both shared."

While Bella did not share any photos with The Weeknd during the bash, she did post a group photo with her mother, Yolanda Hadid, as well as her siblings Anwar and Gigi Hadid. Dua Lipa, who is dating Anwar Hadid right now, could also be seen in the photo.

The Weeknd and Bella reportedly called it quits in August after failing to find time for each other. A source said at the time, "They are in different places right now, physically and mentally. Bella is prepping for her fashion week commitments and Abel is working on his music and his upcoming acting debut. They hope to get back together at one point but for now are focusing on themselves and their project."