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Reese Witherspoon shares a rare photo with her youngest child, son Tennessee, as she marks his 13th birthday. "How is it possible that my youngest boy is 13?!" she wrote of her son, whom she shares with ex-husband Jim Toth. "He never ceases to amaze me with his joyfulness, his brilliant sense of humor and his endless curiosity. I love you so much, Tenn! ?."