According to Arnold’s new memoir, these two eighties celebs had a little sexcapade back in 1985. It all took place during the shooting of Red Sonja, a movie the two were shooting for Troublemaker Studios. The worst part is Arnold was already living with Maria Shriver at the time of the affair!!!
Sidenote: When asked about the affair, Nielson claimed she had no idea Arnold was dating another woman at the time. [TMZ]