However, he didn't take any Academy Awards home at the end of the night.
Bradley Cooper dated many top actresses early in his career, including Renee Zellweger, Cameron Diaz, and Zoe Saldana, his Guardians Of The Galaxy co-star.
A source claimed to Radar Online: "Bradley’s relationship with baby mama Irina began to really fall apart when he started filming with Gaga and she accused him numerous times of cheating on her with his co-star.
"Ever since then, Irina has not been able to trust Bradley at all." Irina was said to have been uncomfortable with their close bond after he "started spending time with Gaga at odd hours." However an insider told The Sun Online that Bradley would find it too disrespectful to his ex to be anymore than friends with Gaga.
The two sang the song Shallow from the Oscar-nominated movie during the Academy Awards ceremony.