She is portrayed by Cameron Richardson.
During the events of the film, Claire has recently enjoyed her success in photography for magazines. She's also shown to have broken up with Dave due to his inability to take their relationship seriously though still wanted more out of the relationship.
However, Dave is still in love with Claire and constantly tries to rekindle their relationship throughout the film. One such attempt is inviting her over for dinner in the beginning of the film. The dinner ends disastrously and Dave tries to explain about his recently adopted chipmunks but only proceeds to alienate a disbelieving Claire even more.
When Claire 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 loses the Chipmunks to Ian due to a misunderstanding, Claire shows genuine sympathy for his loss and loneliness. She plays a pivotal role in helping Dave get his boys back by tricking guards who let him enter the Theater. At the end of the film, Claire shows up to Dave's house once again for dinner. She attended college with Dave and Ian.
- Cameron Richardson didn't reprise her role for the sequels because she disliked her experience of the first film.
- Cameron Richardson was supposed to reprise her role for Alvin & The Chipmunks: The Road Chip because the chipmunks thought she was going to propose and marry Jason Lee's Dave Seville but she was replaced by Kimberly Williams Paisley's Samantha so Samantha took her place.