NEW YORK: Caesars Entertainment says Britney Spears is adding more than 30 dates to her Las Vegas residency. ''Britney: Piece of Me'' will now play shows in October through December and February. Shows have also been added in August and September.

The Planet Hollywood Resort and Casino says the first round of shows in August and September sold out.

The 31-year-old Spears kicked off the two-year residency late last year around the time she released her eighth album, ''Britney Jean.''