Songstress Christina Aguilera is stripping her bad girl image to make room for a classic, soulful look for her upcoming album.

The 25-year-old pop singer revealed her "old-soul sound" inspiration for her as-yet-unnamed follow-up to 2002's "Stripped" last week in London.

"Some of the songs are kept authentic, sticking to a really raw, old-soul sound, where others combine elements of old blues, jazz and soul with a hard modern-day edge, Aguilera told Billboard.com.

The album is expected to be released sometime this summer.

Aguilera is in London to begin a nine-month marketing campaign to promote the European partnership between the telecom company Orange and the cell phone maker powerhouse Sony Ericsson.