And a shocking, recently resurfaced photo is adding more fuel to the romance fire, showing Gaga's lipstick on Cooper's mouth!
The September 24, 2018 picture now is causing love rumors to intensify as it shows the two at the movie's premiere in Los Angeles.
Gaga, wearing a stunning silver gown, also sported a bold red lip—the exact same shade that is seen on Cooper's chin!
One fan crowed online about "lipstick on his face."
So what gives?
After their chemistry lesson at the Oscars on Sunday, February 24, 2019, there's no doubt fans are looking for more evidence that Gaga, 32, and Cooper, 44, could be a couple in real life.
While Gaga recently split from her fiancé, Christian Carino the actor brought his baby mama, model Irina Shayk, to the Academy Awards.
However, things looked awkward for Shayk as Gaga and Cooper appeared incendiary together on stage.
Scroll through Radar's gallery for more on the new photo -- and what it could mean!
The look of love? Talk of Gaga and Cooper being romantically involved has exploded.
Gaga and Cooper performed A Star is Born's hit song, "Shallow," together at the Oscars and looked like they were almost going to kiss on the stage.
The singer has claimed that she "fooled" the Academy Awards audience and made people see exactly what they wanted to see. But it seems her lipstick earlier showed up not on Cooper's collar—but on his mouth.
As Radar reported, fans were wondering if Gaga and Cooper should get a room after showing off their sexual chemistry while singing "Shallow." Bradley began the song on a microphone at the end of the piano but for the last notes he sat next to Gaga and sang the loving lyrics to her.
At the Oscars' piano, Gaga and Cooper smiled at each other after the song ended and held their heads close to each other as the audience went wild. "Thought they were gonna kiss what the hell I was sat here sic thinking about Bradley's girlfriend," a fan wrote on social media.
The photo of Gaga and Cooper from September 2018 now has followers buzzing. "I knew it," a fan wrote triumphantly about Cooper's visible lipstick stain.
Cooper and Shayk, 33, have been together since 2015 and they have a one-year-old daughter. Gaga confirmed she was engaged to agent Carino in October 2018 but as Radar previously revealed exclusively, they split after he shared a secret romantic dinner with a stunning brunette woman in West Hollywood.
aga didn't wear her engagement ring at the Grammys, and soon, the world learned she was footloose again. Then her flirtatious attitude towards her co-star Cooper hit headlines. While accepting the Oscar for "Shallow," Gaga gushed to him, " Bradley there is not a single person on the planet that could have sang this song with me but you. Thank you for believing in us, thank you so much."
We pay for juicy info! Do you have a story for RadarOnline.com? Email us at firstname.lastname@example.org, or call us at (866) ON-RADAR (667-2327) any time, day or night.