Bradley and Gaga set tongues wagging with their live rendition of Shallow from their film A Star Is Born when in front of millions of viewers they put on a steamy and loved-up display up on stage.
Bradley gazed longingly at Gaga as she belted out the lyrics at the piano, before walking across the stage and sitting down next to her, wrapping his arm around her waist and joining in on the final chorus.
All the while this was going on, Bradley's Victoria's Secret model partner Irina was watching on from the front row - no doubt with a stone-cold grimace on her face.
And the Bradley/Gaga rumours were picked up on today's Good Morning Britain, with both Mel B and Piers Morgan slamming the pair for their cringey display.
"When we watched the end, when they come together..." Piers said to Mel, as she put her head in her hands.
"See, I felt so uncomfortable for Bradley's girlfriend, oh my gosh," she shouted.
"It was the look of love, wasn't it?" Piers pointed out.
"It really was and that's the whole gossip. That's the whole thing," Mel agonised.
Vinny Jones, who was guest appearing on GMB alongside Mel and Perez Hilton, quipped: "The model or the singer."
"Stop it!" Mel cried out.
Piers went on: "Lady Gaga taking her engagement ring off - she just broke off from her fiance and if you put the maths together, you have engagement ring off, and then staring at Bradley Cooper in a way that I would say crosses a few lines."
"But I would like to think it was part of the whole performance, because there's a women's code and hopefully that's not... hopefully it's only professional," Mel added before trailing off.
Mel wasn't the only one to notice sparks between Bradley and Gaga during their performance.
Irina, who has been dating Bradley since 2015, had placed herself in between the co-stars earlier on in the ceremony, sparking speculation she didn't want them sitting together.
The Russian model was seen sitting firmly next to Gaga while Bradley sat on her other side, using her body as a physical barricade between the pair.