So those rumors about Katy Perry and John Mayer being back together? They’ve got legs.

In fact: “Katy and John are back together,” a source tells Radar Online. And the reunion apparently flies in the face of her pals’ stern disapproval.

“Although her friends have warned her to be careful, she is already ignoring all of the red flags,” the source explains. “She is not listening to anyone and is going into this full force.”

Oh man, not full force! There aren’t any more intense forces than that!

The on-again, off-again couple even doubled down on the recent sleepover that first got everyone’s attention.

Mayer reportedly hosted Perry in his favorite home-away-from-home, the Four Seasons hotel in Beverly Hills.

A source says the two were “holed up in Mayer’s room for several days.” I can think of worse places to be holed up, honestly.

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