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Luke Tonkin is an Australian actor who made his professional musical theatre debut in the Helpmann-nominated children's musical My Grandma Lived in Gooligulch and toured the show nationally. He also played the role of the Big Bopper in the Australian tour of Buddy - The Buddy Holly Story. He has toured Australia in Wombat Stew and Happy Birthday Peter Rabbit.
Tonkin is well known in his home town of Ballarat due to his work with the Sweet Mona Choir, Entertainers Anonymous and Sovereign Hill. He is also remembered as the "Cougar Guy" in the Australian television commercial "5 Cougars Thanks".