Watch John Mayer Cover Diana Ross for Andy Cohen's 50th Birthday Special

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John Mayer and Andy Cohen on Watch What Happens Live with Andy Cohen

Andy Cohen couldn't let one of his milestone birthdays pass without a celebration on his Bravo show Watch What Happens Live, and he even recruited BFF John Mayer to help him celebrate. The "New Light" singer helped make Sunday's episode extra festive by co-hosting the "Andy's Big Five-Oh!" special.

Despite his long list of celebrity ex-girlfriends, Mayer couldn't help but wonder if fans speculate a budding romance between him and his TV show host friend. “Do you think people wonder if we’re in a secret relationship?” Mayer asked Cohen.

Cohen's response said it all: "All my team does."

One of the highlights of Mayer's appearance -- and a true proclamation of his love, platonic or otherwise -- was him delivering a rendition of "It's My House" by Diana Ross, one of Cohen's favorite songs.

"I've done nothing but learn that song in the last 48 hours," Mayer explained, after a stunned Cohen thanked the singer with a swift kiss on the lips. "I have eaten, breathed and slept 'It's My House.'"

"Well, I hope you put that out," Cohen suggested after his repeated, giddy "wow"s.

Mayer's conversation didn't help much with putting to rest the rumors that he and Cohen shared a behind-the-scenes love affair. “Look, I don't have the world's greatest track record when it comes to celebrity relationships, so it's amazing to watch your friends humor me on a friend level but also keep a fair distance from me,” Mayer explained, thanking Cohen for linking him with peers he fears would avoid him otherwise.

“Dating John Mayer at this point is conceptually just sort of a no-no," he hilariously continued. "So, it's really fun to get to hang out with your friends -- A-list star friends -- who otherwise would be highly uncomfortable sitting around me. And I want to thank you for that."