Katy Perry Boyfriend List: Who Is ‘The One That Got Away’?

“Witness” singer Katy Perry has dated a lot of well-known guys, from musicians like John Mayer and Diplo to actors such as Orlando Bloom.

During a talk with James Corden during her 72-hour YouTube livestream on Sunday, the singer got candid about her love life and even ranked her ex-boyfriends from best to worst in terms of their abilities in the bedroom.

READ: Katy Perry talks about her rift with Taylor Swift: ‘She started it’

Perry and Corden played a question and answer game in the livestream, and the rule was for Perry to answer a question from Corden or eat a questionable snack. When asked about her ex-boyfriends’ prowess in the bedroom, the 32-year-old pop star decided to weigh in. “They’re all amazing lovers and I would have sex with all of them after I get out of this place!” she said.

“Working on the notion that they’re all good,” Perry ranked Mayer as her No. 1, followed by Bloom. Diplo ranked last.

The surprising bit in the game was Perry’s revelation of the one guy she regrets losing. She revealed that “You Raise Me Up” singer Josh Groban is “the one that got away” after they were linked back in 2009.

Groban subsequently dated “2 Broke Girls” star Kat Dennings, but they broke up this year. “It was a mutual breakup,” a source shared with E! News. “They are still friends and care about each other, but it’s not the right time for them now as a couple.”

They became a couple back in October 2014 with the help of Denning’s co-star and best friend, Beth Behrs. “They’re in this crazy business, they’re both very calm and mellow and wonderful,” Behrs told People. “And he treats her like a princess, and it’s amazing.”

Groban even told Ellen Degeneres earlier that he fell in love with Dennings because she was a “nerd” just like him. “She’s well, she’s such a brilliant and funny person. Humor is such a huge things for me, so the fact that we could talk about Monty Python and all sorts of weird other things, I was like, ‘OK, yeah, we’re on the same page,’” he said.