Katy Perry really was "Waking up in Vegas" this New Year's day.
The pop star performed a private concert at Las Vegas' Caesars Palace on Tuesday night for a group of invited guests. Costume designer Johnny Wujek was in the crowd and snapped this photo of Perry while she performed.
People reports that Perry put on an 80-minute show, which was a compilation of her greatest hits. After the concert, Perry and boyfriend, John Mayer, attended a private party at FIZZ Las Vegas.
Perry and Mayer have been in Vegas for nearly a week now. They saw Britney Spears' "Piece of Me" show, as well as a Fleetwood Mac concert, where Stevie Nicks dedicated the song "Landslide" to the "Roar" singer.