Tickets to Britney Spears' upcoming Las Vegas residency at Planet Hollywood are quickly selling out ahead of the show's December kick-off.

The pop singer's two-year residency, officially called Britney Spears: Piece of Me, begins Friday, Dec. 27.

All of the highest-priced VIP packages for the first 16 shows that went on sale Sept. 20 sold out "instantaneously," her manager, Larry Rudolph, told E! News. "There were more added, because of the demand."

"This is the best-selling show in the history of Vegas," he added. "We have a great thing going here. We have a great show we're putting together. We have nothing but greenlights ahead of us. We have amazing sales."

The next block of tickets are scheduled to go on sale in a couple of weeks but Rudolph said Caesars Entertainment, which operates Planet Hollywood, may release them earlier because of the "high demand."

"As we suspected, ticket demand for Britney Spears' headlining residency at Planet Hollywood has been extraordinary," Caesars chief marketing officer Tariq Shaukat said in a statement released Tuesday. "This is as strong an on-sale performance as we've seen for any of our iconic Las Vegas headliner shows."

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A spokeswoman for parent company Caesars Entertainment told Newsday that Spears is set to do 48 shows each year as part of her Planet Hollywood residency. Spears opened up to Ryan Seacrest about the gig during a recent appearance on his morning radio show.

"Every time I do a show, I like to really bring it and I love to be really entertained and coming from theater, I love to put on a show," she said. "So we are going to have all the works-snow, water, rain, everything! We want the feeling that fans will be in the show with me. We're going to have a cool set-up for them with a party vibe so they are really there with me."

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