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(Yahoo!) - Katy Perry and John Mayer attended The Friars Foundation gala honoring Don Rickles at theWaldorf Astoria in New York City on Monday night, and the couple were photographed leaving the venue together holding hands.

While Mayer, 35, walked the red carpet, Perry, 28, snuck into the event, making a low-key entrance to meet her on-again beau.

“Katy arrived after the event had already started, but before dinner was served,” a source inside the party tells ABC News. “A waiter brought a chair to John’s table for her just before her arrival.”

Apparently the duo was quite “affectionate” and “very lovey-dovey."

“They were smooching and rubbing one another’s backs,” continues the insider. “And Katy had her arm around John at one point.”

Perry - who stunned in a silk Sally LaPointe gown - looked on adoringly as her beau performed the song "One for My Baby (and One More for the Road)."

Mayer and Perry also had date night together this past Saturday, but purposefully avoided being photographed together. The "Paper Dolls" singer and Perry hit up both the Greenwich Hotel and Bowery Hotel in NYC, but entered and exited separately. Still, witnesses say it was obvious the two were dating again.


On another note -- does anyone else notice that Tiffany's shopping bag in John's hand?!

Photo Credit Splash News