Washington, Mar 18 : Madonna is working on the last album in her contract with record label Warner Bros., and it will again be a compilation of her hits.
The `Material Girl' will reportedly record new songs this summer, which will be meant specifically for the forthcoming release.
The swansong album, which is currently untitled, is scheduled for a release in September.
It will be her first hits album after 2001''s GHV2, reports Contactmusic.
Madonna has previously released the `Immaculate Collection' in 1990.