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