Who is the girl with Justin Timberlake on rock your body?

The girl in the "Rock Your Body" music video by Justin Timberlake is model and actress Kelsey Chow. The video features her in various scenes as she interacts with Timberlake, complementing the song's themes of attraction and flirtation. Kelsey Chow is known for her work in television and film, including roles in "Pair of Kings" and "Teen Beach Movie."