Nicole Richie’s ‘joke’ Memorial Day email invitation has met with further criticism - this time from a healthy weight loss group. The Simple Life star poked fun at her alleged eating disorder in the invitation, which leaked last month, warning there would be scales outside the party and wannabe attendees should start starving themselves immediately. But campaign group Thinspiration haven’t seen the humorous side. In a MySpace posting they write, “If it was a joke, it wasn’t funny. Richie is a disgrace.”