LAS VEGAS -- Britney Spears has begun her early retirement in Las Vegas with a show that looks strikingly like the eye-popping Cirque du Soleil productions found elsewhere on the Strip.
The debut of Spears' long-term casino gig Friday kept an audience of about 4,500 on their feet for 90 minutes.
The young-for-Vegas crowd was there for the danceable hits and the spectacle, which included acrobatics, a ring of fire, confetti, a live band, frenetic costume changes and a frequently airborne Spears.
The show's production values are unusually high for a casino residency, often calling to mind the golden age of music videos. Its high-concept set pieces featured a cadre of backup dancers who danced in human-sized hamster wheels and somersaulted over the Grammy-winning star.
Spears, 32, has signed on to perform 50 shows each in 2014 and 2015 at the Planet Hollywood Resort and Casino.
Officials with Caesars Entertainment Corp., which owns Planet Hollywood, say Spears sings her entire set. Entertainment Programming Vice President Kurt Melien said she sings against a recorded track of her vocals to help her through the more physically grueling parts of the set, and add the electronic undertones that characterize many of her songs. Some audience members said they thought they detected lip syncing.
She cuts a different figure from the typical Strip headliner. Other successful Las Vegas acts -- including Shania Twain, Elton John and Celine Dion -- have generally attracted an older audience. Judging from Friday's show, her fans are more likely to be found at a casino megaclub than in front of a slot machine.
Still, the show is not immune to nostalgia, one of the prime currencies in Las Vegas entertainment. It includes several callbacks to the 1990s and early 2000s, including plaid shirts tied around dancers' waists and a recap of the barely-there sparkling costume Spears wore in the "Toxic" music video.
Spears' younger self haunted the show, with clips of her early performances playing on huge monitors. Notably absent from those monitors, to the displeasure of some fans in the cheap seats, were any live close-ups of what was unfolding onstage.
On his way out, Shane Sodeman, of San Diego, complained that Spears hadn't donned the sexy schoolgirl outfit or the skintight orange jumpsuit she wore in sexier days. A version of the jumpsuit was displayed in the lobby.
Maryn Harberg, 29, spent the night dancing in her $139 seat, on the upper end of the $59 to $179 scale. She'd come to the Strip for just one night, for Britney.
"I loved it," said the beaming Boston resident.
Most of the show appeared physically grueling. Spears has lost some of the crisp precision that characterized her dancing a decade ago, but she was in constant motion during the show, allowing her backup dancers to throw her through the air, and flying around in a huge angel costume for a performance of "Everytime."
She spent downtime marching around stage and posing, banishing the specter of her disastrous 2007 MTV performance, which also took place in Las Vegas, and was a career low point.
Younger divas Selena Gomez, Miley Cyrus, and Katy Perry lent moral support from the audience.