Jenna Rink is a fictional character from the 2004 film 13 Going on 30. In the movie, she is portrayed by Jennifer Garner as a 13-year-old girl who magically wakes up as a 30-year-old woman. The story explores themes of growing up, self-discovery, and the challenges of adulthood. As a teenager, Jenna is eager to fit in and be popular, but she faces typical adolescent struggles. The film highlights her journey as she navigates her new life, reconnects with her childhood friend Matty Flamhaff, and learns valuable lessons about friendship and authenticity.