I Believe I Can Fly singer R. Kelly said that he met his match when he worked with Lady Gaga on her track Do What U Want.
The 46-year-old R&B star has insisted that Gaga is "very talented" and a "gift to the world."
Speaking to The Sun newspaper, Kelly said: ''I met my match when I met Lady Gaga. There's no doubt about it. She's very talented, she has a vision, she has a gift to the world.
''Then she has balls and she's not afraid to express herself.
''I don't think she does things to be controversial, she's just being herself.''
R Kelly's new album Black Panties is released on December 10.