"She called me about 10 days before and she said, 'I just want to talk to you and make sure I don't offend. That what I'm doing is okay with you,' " Andrews tells PEOPLE. "It was very generous of her."
"She said she'd been working so hard and she was singing everything in my keys. I said, 'Why? They're very high, even for me.' And she said, 'Because I wanted to honor you, so I did them in your keys.' That seemed like going one step beyond any place she needed to go."
What did Andrews think of the pop star's performance?
"She hit it out of the ballpark," she says.
"And then she was gracious enough to hand it to me. So that's a really wonderful thing to do too I think."
"As they say in Hollywood jargon, 'She rates tall in my book,' " Andrews adds.
Queen of noble approval

Source:
http://www.people.com/article/lady-g...andrews-oscars