Air Head Being Nikki by Meg Cabot

Emerson Watts never expected to wake up in a supermodel's body. After a freak accident leaves her trapped in the glamorous life of Nikki Howard—a vapid celebrity with a troubled past—Em must navigate a world of paparazzi, fashion shoots, and dangerous secrets. As she uncovers the truth behind Nikki's mysterious disappearance, Em realizes that looking perfect on the outside doesn't mean your life is perfect on the inside. A witty, fast-paced adventure about identity, friendship, and discovering who you really are beneath the surface.