The 37-year-old actor has given his full support to his former fiancee - who he split from in July 2016 after five years together - and hopes her new movie, 'A Star Is Born', is hugely successful.
Asked how he feels about the singer's move into movies, he told 'Entertainment Tonight': ''Proud. Only proud. I want it to do really, really well.''
Meanwhile, Gaga recently spoke of the ''instant connection'' she felt to her 'A Star is Born' co-star and director, Bradley Cooper, when they met for the first time to discuss the project over pasta and her piano.
She said: ''''I opened the door, and the second I looked into his eyes I felt an instant connection to him.
''We're both from the east coast, we're both coming from Italian families, I was like 'Are you hungry?' I cooked him up some leftover pasta, and we were eating, and before I knew it, he said 'I would like to sing with you, if that's OK.'
''And we went to the piano, and I printed out the sheet music for a song that he wanted to sing called 'Midnight Special.' ''
Gaga admitted she wasn't prepared for how ''incredible'' Bradley's singing voice was.
She added: ''I sat down and started to play, and he began to sing and I just stopped instantly in my tracks, and I looked at him and I said, 'Bradley, you have an incredible voice, you sing from your gut, you sing from your soul, you sing from the nectar of your being.'
''He said, 'Should we film it?' So he filmed it on his iPhone, and we all of a sudden started to sing together, harmonising and laughing, and looking at each other.
''It was instantaneous, and I knew in this moment that I could make this film with him, and I truly believe that there's no other actor or director in the world that could have played this role or made this film.
''There's no other actor that could play a rock star, he's the only one.''
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