The pop star capped off 2013 with a private show at Caesars Palace in Las Vegas Tuesday night. Invited guests of the hotel attended the show, as did Perry's boyfriend, John Mayer, who watched inconspicuously from the sound booth.
The show was essentially a compilation of Perry's greatest hits.
Perry made no mention of Mayer during her 80-minute set, but she did celebrate the arrival of 2014 with him at a private party at FIZZ Las Vegas.
The concert capped off Perry's nearly weeklong stay in Sin City, where she checked out Britney Spears's new show on Friday, and apparently got emotional while attending a Fleetwood Mac concert on Monday after singer Stevie Nicks dedicated "Landslide" to Perry.
The moment of speechlessness apparently gave Mayer a chance to highjack Perry's phone and send out Tweet from her account.
He wrote, "John here. Katy can't write because she's getting over Stevie Nicks dedicating a song to us at the Fleetwood Mac concert. Unforgettable."
John here. Katy can't write because she's getting over Stevie Nicks dedicating Landslide to us at the Fleetwood Mac concert. Unforgettable.— Katy Perry (@katyperry) December 31, 2013
While I'm at it I have a couple things I'd like to get off my-oh, she's motioning for the phone back. Gotta go!! -JM— Katy Perry (@katyperry) December 31, 2013