Warner Bros., Michael Desmond/SHOWTIME
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Following the cult show's cancelation, Veronica Mars' titular heroine did a stint on Heroes before being launched into the mainstream when she starred in Forgetting Sarah Marshall opposite Jason Segel and Russell Brand. Bell then bounced between guest appearances on shows, such as Party Down and films, including You Again and Scream 4. (She was also the narrator on the CW's Gossip Girl.) She currently stars on Showtime's House of Lies and recently showed off her musical chops, providing the voice of Anna in the hit animated musical Frozen.