PENÉLOPE CRUZ, 39
The bombshell oozes sex appeal – and even has her own lingerie line to show for it. Luckily, the Spanish star takes care to protect her assets. "I'm very careful [about my skin]," she told PEOPLE. "I go in the sun with like 50 protection. I like being in the sun, being on the beach and lying there with a book, but I put on protection no matter what."