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And even if you've seen the show already, be prepared to book another trip to Sin City because Brit has some new ideas in the works. "I definitely have some major changes planned. I'm getting together with my team this week to go over the set list, design some new costumes and dream up new props," she said. "There are a few songs that are fan favorites that I really want to add to the show. It's very exciting! If you haven't seen the current show yet, you should come out before the end of the year."

Planet Hollywood offered her a new deal at the end of July, but on Aug. 16 Spears told me that she hadn't yet made a final decision.

"I'm not really sure," Spears said at the Teen Choice Awards. "I haven't made up my mind. I really love doing the show. It's a lot, a lot of fun, but I'm kind of torn right now. I don't really know what I want to do."

Fortunately, she decided to stay. If she hadn't, her last shows would have taken place over New Year's weekend.

While rumors started circulating as early as 2011 that she was in talks for a residency, Spears confirmed the news in September 2013 during an appearance on Good Morning America. Piece of Me launched on Dec. 27, 2013.

She celebrated her 100th show last month.

And that's not all the Britney news we've got in store for you! Tune into E! News tomorrow night at 7 p.m. and 11 p.m. to find out what she said about releasing some new music!