© @Copyright HELLO! Hello! Magazine Sarah Michelle Gellar delighted fans with a series of throwback pictures in a sweet birthday message for former Buffy the Vampire Slayer co-star Seth Green. MORE: Sarah Michelle Gellar celebrates big milestone in age-defying postThe actress, who appeared in the popular teen drama from 1997 until 2003, uploaded the pictures on her Instagram on Tuesday, writing in the caption: "Well @sethgreen, 36-plus years of friendship, three continents, goodness knows how many hair colours, and shockingly for Hollywood, only two marriages between us. "She added: "Sadly, this is the longest I've gone without a hug from you EVER.
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