The 'Chicago Fire' star can't stop gushing about his ex, who has garnered critical acclaim for her role in the hit film.
ET celebrates how Mother Monster came to be!
Gaga also praised 'A Star Is Born' co-star Bradley Cooper during a Thursday appearance on 'The Late Show with Stephen Colbert.'
The outspoken advocate opened up about the recently hearings about Dr. Ford and Judge Brett Kavanaugh.
The 32-year-old popped into a movie theater in New York City to surprise fans at an advance screening of her new movie.
A star was born nearly 20 years ago with an uncredited role on 'The Sopranos.'
Cooper makes his directorial debut with 'A Star Is Born' but ET is throwing it back to when the actor was just "rising star" status.
'I would not be here without you,' she told the crowd.
The bond between these two keeps getting better!
The actor opens up about his early career in W Magazine.
ET gives you an exclusive behind-the-scenes look at Cooper's real-life talent!
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After much anticipation, the debut track from the motion picture soundtrack was released by Interscope Records on Thursday.
ET sat down with the legendary entertainer to talk about her new music, 'A Star Is Born' and more.
