Cuthbert is a devoted hockey fan and Los Angeles Kings season ticket holder, as are her mother and brother, Jonathan, who are active in the sport. She maintained her own blog on the NHL's web site.
In 2000, Cuthbert graduated from Centennial Regional High School and journeyed to Los Angeles, California to pursue a Hollywood acting career. Also in 2000 she took the role of Kim Bauer, daughter of CTU agent Jack Bauer in the television series 24. Cuthbert had given herself a deadline of six weeks to make something of her trip and was about to return home when she was offered the part during the fifth week. The show drew continual critical praise, though Cuthbert did not appear at all in the show's 4th season and guest-starred in only three episodes from the 5th.