On June 11, Jessica Biel became the latest celebrity face of the anti-vaccine movement when she surfaced in California's capitol to lobby against a state bill that would limit medical exemptions for immunizations without approval from a public health officer. Accompanying her was controversial activist Robert F. Kennedy Jr., the founder of Children's Health Defense, which has claimed that vaccines are dangerous and unnecessary.

Multiple members of the state Assembly and state Senate welcomed her to Sacramento, posting grip-and-grin pictures to their social media accounts. Kennedy thanked her for being "courageous" on "a busy and productive day." State Senate Bill 276, now making its way through the legislature, is meant to crack down on doctors who provide what sponsoring senator Richard Pan describes as "fake" medical exemptions.

Neither Biel nor Kennedy responded to THR's requests for comment by press time. But Biel explained her appearance and clarified her position on immunizations in an Instagram post early Thursday morning, writing in part that she is "not against vaccinations."