Is Britney Spears poised to rehab her career? An insider "not affiliated with Spears or her label," the New York Post specifies, says there are "four definite hits" on the fallen pop tart's in-the-works album, adding, "It's amazing".... In other musical notes, Page Six also hears that "Looking Forward to Looking Back," a track on Mandy Moore's new Wild Hope CD, takes digs at ex-beau/ Scrubs star Zach Braff (who most recently - and he's a hard one to keep up with! - has been spied up in Six Degrees cutie Shiri Appleby's grill). Says a source, "We all assume it was about Zach, [because] he was such a cheater".... Online buzz says that Kelly Clarkson has been offered "special cameo" appearances on the American Idol summer tour, to help push her My December album.