She also is giving two concerts in London in June. A Spears' representative announced those concerts Wednesday and said they will be her only European stops on a world tour.
Spears is expected to sing "Womanizer" on television this Saturday. The popular single was recorded for a soon-to-be-releasd album.
Famous singers often coach "X Factor" contestants during the show, but the representative says Spears will only be performing - not coaching.
The British singing contest is similar to "American Idol" in the U.S.
Spears is now on a comeback from a two-year downward spiral that included a divorce, a custody battle and public meltdowns.