Nathalie is a South African actress, known in that country for her role as Joey Ortlepp in the SABC 3 soap opera Isidingo from 2001 to 2004. She is a graduate of Rhodes University, and currently lives in Wellington, New Zealand

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Internationally, she has been seen in the film District 9 and the 2005 television remake The Poseidon Adventure. She also voices the character of DottyWot in the New Zealand children's series The WotWots.

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Boltt currently portrays Penelope Blossom in the CW television series Riverdale.