Singer Lady Gaga once mistook actress Isla Fisher for Amy Adams.

Gaga and Fisher met at a star-studded Hollywood bash where the singer misunderstood Fisher as Adams and praised her for "American Hustle", reports dailymail.co.uk.

Sharing the awkward moment on TV show "Jimmy Kimmel Live!", Fisher said: "I remember one time I was at this fancy Hollywood party, the Vanity Fair (Oscars Party). And I was there, excited, all dressed up, at the bar and schmoosing with showbiz types.

"And the crowds parted and there was Lady Gaga and she's heading right towards me. And she says, 'Thank you, your performance in ‘American Hustle', Amy, was amazing.'"

But, Fisher said she "loves" the musician "so much" that she didn't correct her on her mistake.

"And I'm thinking, 'Oh my gosh, it's Lady Gaga I love her so much I don't want to tell her the truth'," she added.