Jennifer Ann McCarthy (born November 1, 1972), sometimes credited as Jenny Wahlberg, is an American actress, model, television host, author, screenwriter and anti-vaccine activist. She began her career in 1993 as a nude model for Playboy magazine and was later named their Playmate of the Year. McCarthy then had a television and film acting career, starting as a co-host on the MTV game show Singled Out, then some eponymous sitcoms, as well as films such as BASEketball, Diamonds, Scream 3, and Santa Baby. She is a former co-host of the ABC talk show The View.
McCarthy has written books about parenting, and has promoted research into environmental causes and alternative medical treatments for autism. She has promoted the disproven idea that vaccines cause autism, and she believes that chelation therapy helped cure her son of autism. McCarthy has been described as "the nation's most prominent purveyor of anti-vaxxer ideology". Her claims to the contrary have been met with strong criticism.