Buffy rebuffed! Instagram users are lashing out at a “thinspiration” post Sarah Michelle Gellar shared ahead of Thanksgiving. The 41-year-old uploaded the inciting Instagram on Sunday, November 18, posting photos of herself from Maxim’s December 2007 issue. In the portraits, she poses in black lingerie, baring her svelte physique. “I’m just going to pin these up all over my house as a reminder not to overeat on Thursday,” Gellar wrote in the caption, adding the hashtag #thanksgivingprep. The Buffy the Vampire Slayer alum’s photos garnered praise from other celebs, with Debra Messing commenting, “Are you KIDDING ME!?!” and Tiffani Thiessen...