She is played by Cameron Richardson.
Alvin and the chipmunks
During the events of the movie Claire has recently enjoyed her success in photography for magazines and is shown to havie broken up with Dave Seville due to his inability to take their relationship seriously. However Dave is still in love with Claire and is constantly trying to rekindle their relationship throughout the film. One such attempt is inviting her over for dinner in the beggining of the movie. The dinner ends disastrously and Dave attempts to explain about his recently adopted chipmunks as the reason but only proceeds to alienate a disbelieving Claire even more. However when Claire later meets the Chipmunks in person, she falls in love with them right away and begins to follow their career as her most recent assignment. When Dave later loses the Chipmunks to Ian due to a misunderstanding Claire shows genuine sympathy for his loss and loneliness. She later plays a pivotal role in helping Dave get his boys back by tricking guards into letting him in the Theater. At the end of the film Claire shows up to Daves house once again for dinner. She attended college with Dave and Ian.
Claire does not appear in the Squeakquel nor is she mentioned. There is a third movie in which she may appear or maybe not, (She was orignally going to be the mother of the chipettes but the producers and the director didnt think it would work as it would probably affect her, dave's and the chipmunks relationship so decided to give them to Ian.)