Kaarina was born in Vancouver, British Columbia and raised in Richmond, British Columbia. She got her start with Theatre Under the Stars in Stanley Park and has performed in Canadian and Broadway productions of numerous musicals, including Anne of Green Gables – The Musical, The Phantom of the Opera, Les Misérables, and Rent.
In 2010, Kaarina was cast as the role of Barbie in Barbie: A Fashion Fairytale, replacing usual actress Kelly Sheridan for several films in the Barbie series before Sheridan resumed the role in 2012.
In 2012, she provided the voice of Kelly Hamdon in SheZow.

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