Wow, Katy Perry definitely knows how to give a compliment! While she was talking to SiriusXM, she couldn't stop gushing about how amazing Ariana Grande is and how she felt lucky to hang out with her — but the funny thing is, Katy is one of her idols and she's probably freaking out more than ever right now!

Last June, Ariana tweeted about how much she loves Katy, but just a year later, Katy is talking about her like she's one of her BFFS!

During her interview, Katy said, "She has the best female vocal in pop music today. She has literally the best voice — the best voice live. She kills it."

Not only does Katy think she's great, but she's also become a mentor to Ariana, being there whenever she needs her!

"I got to hang out with her and listen to her record before it came out because I wanted to reach out to her and just be like, 'Hey girl — you're about to go through a whirlwind. Let me just give you a couple of tips if you ever need anything — a hairstylist, makeup artist, a stylist — whatever,'" Katy said. "She's the sweetest girl and I just wish her the best. If anyone were to do that to me, I would have felt really lucky."

Ariana still feels extremely lucky and can't even believe Katy said such great things about her!

Do you think it's cool that Katy is becoming friends with Ariana? Let us know in the comments!

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