Spears booked eight dates in October, nine in November and four in December, including a New Year's Eve finale. The show originally opened Dec. 27, 2013.
Spears just released her new single "Pretty Girls" with Iggy Azalea, and the song has already reached No. 1 on the iTunes Pop Chart. The pop princess even made room for the song in the latest rendition of her Vegas show.
The production includes more than 20 of her hits, including "Baby One More Time," "Oops I Did It Again," "Toxic," "Circus," "Womanizer" and "Slave 4 U."
Spears canceled shows last weekend and Wednesday night after suffering an ankle injury while performing last week.