The 88-year-old singer revealed the news in an interview with Page Six this week. Lady Gaga and Kinney have been together since 2011, and announced their engagement in February.
"She's marrying a very wonderful man, very talented and very handsome," Bennett said of the pop star and Chicago Fire actor. "I think he's going to be highly successful in films. He's a very nice person."
08:04 La La Land leads Bafta nominations14