Star Island by Carl Hiaasen

Twenty-two-year-old pop star Cherry Pye is attempting a comeback from her latest drug and alcohol disaster. Ann DeLusia is Cherry's 'undercover stunt double', standing in for Cherry whenever the singer is too wasted to go out in public. But, one night, Ann-as-Cherry is mistakenly kidnapped from a Miami hotel by an obsessed paparazzo named Bang Abbott. Now the challenge for Cherry's handlers (comprising the world's pushiest stage mother; perverted record producer; nipped-and-tucked twin publicists; weed-strimmer-wielding bodyguard) is to rescue Ann while keeping her existence secret from the public. Will Bang achieve his fantasy of a private photo session with Cherry? Will Cherry sober up in time to lip-synch her concert tour and promote her new album, Skantily Klad? And will Ann escape from Cherry's shadow?