Victoria Beckham made a joke about her famously strict diet in her first TikTok video, which she shared to the social media platform this week. “Tell me you’re Posh, without telling me you’re Posh. I’ll go first,” the fashion designer and former model and Spice Girl member Posh Spice says in the video. A waiter in a red suit then walks over to the table where Beckham is seated, and removes a cloche from a plate in front of her. As the video lingers on the shot of the meal – grilled fish and steamed vegetables – Beckham says, “I…