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Open Image ModalOlesya Rulin played Kelsi Nielsen... (credit:Disney Chan/Everett/REX Shutterstock)
(02 of16)
Open Image ModalAfter starring in the first film, Olesya scored a number of roles, and in the years since has juggled the sequels with other projects.Her credits include TV shows 'CSI: Miami', 'Power' and 'Greek'. (credit:Chris Pizzello/Invision/AP)
(03 of16)
Open Image ModalAlyson Reed played Ms. Darbus... (credit:Disney Chan/Everett/REX Shutterstock)
(04 of16)
Open Image ModalAlyson has made a brief appearance in 'Modern Family', but many fans will remember her as Judge Conti, who presided over Bree Van de Kamp in her trial in 'Desperate Housewives'. (credit:Eric Charbonneau/Invision/AP)
(05 of16)
Open Image ModalZac Efron played Troy Bolton... (credit:Disney Chan/Everett/REX Shutterstock)
(06 of16)
Open Image ModalZac has taken on many projects, impressing in 'The Paperboy' and 'Bad Neighbors', but we'll never forgive him for the EDM movie 'We Are Your Friends'. *shudders* (credit:Eric Charbonneau/Invision/AP)
(07 of16)
Open Image ModalVanessa Hudgens played Gabriella Montez... (credit:Disney Chan/Everett/REX Shutterstock)
(08 of16)
Open Image ModalThe actress recently once again showed off her voice on 'Grease: Live', winning praise for her performance, which took place just hours after learning that her father had died. (credit:FOX via Getty Images)
(09 of16)
Open Image ModalAshley Tisdale played Sharpay Evans... (credit:Disney Chan/Everett/REX Shutterstock)
(10 of16)
Open Image ModalDisney kid Ashley still works with the channel, starring in series 'Phineas And Ferb', while off-screen, she got hitched to musician Christopher French in 2014. (credit:Rich Fury/Invision/AP)
(11 of16)
Open Image ModalCorbin Bleu played Chad Danforth... (credit:Disney Chan/Everett/REX Shutterstock)
(12 of16)
Open Image ModalWeird fact time: Corbin Bleu is the celeb with the third-highest amount of Wikipedia pages in different languages. He's beaten only by the Pope and Barack Obama. Bizarre. (credit:Star Max/IPx)
(13 of16)
Open Image ModalChris Warren Jnr played Zeke Baylor... (credit:Disney Chan/Everett/REX Shutterstock)
Premiere Of Disney's "High School Musical 3" - Arrivals(14 of16)
Open Image ModalChris currently stars in TV series 'The Fosters', and also popped up in the US version of 'The Inbetweeners' in 2012. (credit:Alberto E. Rodriguez via Getty Images)
(15 of16)
Open Image ModalMonique Coleman played Taylor McKessie.... (credit:Disney Chan/Everett/REX Shutterstock)
(16 of16)
Open Image ModalMonique continues to have a successful acting career, but she's also been praised for her humanitarian efforts, being named a UN Youth Champion. (credit:Chris Pizzello/Invision/AP)