Sun's Out Buns Out! Heidi Klum Cheekily Avoids Tan Lines By Sunbathing Naked

Bottoms up for Heidi Klum! The newly single 44-year-old star shared a sexy selfie on Instagram Thursday, revealing her derriere while sunbathing. "California Dreaming," Klum captioned her photo. Back in August, the longtime Project Runway host told PEOPLE, "I tan topless because I saw my mom do that." The mother of four's latest nearly naked photo is a stark contrast to her Halloween costume this year. RELATED GALLERY: Celeb Vacations: Scott Eastwood is 5 Margs Deep in Mexico, Halle Berry Says N...