Article continues below advertisementHeidi Klum almost stripped fully naked for a tanning session.The supermodel, 52, went topless as she soaked in the sun on Sunday, January 4.Klum solely wore a skimpy black thong while she lay face-up on a brown towel outdoors.Article continues below advertisementSource: @heidiklum/InstagramHeidi Klum ditched her top by the water.She closed her eyes and extended her legs in front of her while the sun set over the water."Golden hour ☀️," the star captioned her post.Fans dragged Klum in the comments section for exposing too much.