Former porn star Jenna Jameson used a brass knuckle iPhone case when she beat up her assistant in a California salon over the weekend according to reports. Jameson, 39, was charged with battery after allegedly assaulting her assistant, Britney Markham, with the accessory turned weapon following accusations she had stolen from her. Markham claims the mother of two entered a Newport Beach salon on Saturday yelling at her, hours before planning to celebrate her 39th birthday at Heat Ultra Lounge in Anaheim that night. Beat down: Jenna Jameson allegedly used a brass knuckle iPhone case, possibly the one seen in her hand, to hit her assistant in a California salon over the weekend Similar style: Britney Markham, left, appears to own the same iPhone case, having posed in several pictures with the item that's sold online for around $15 She allegedly used the case to punch her assistant in the stomach and back while yelling 'I