In honor of the first ever Genes Day on Friday, October 22, Lancome is joining forces with St. Jude Children's Hospital, where $7 from sales of their latest product, Genifique Youth Activating Concentrate, goes towards cancer research. So what are we doing to celebrate Genes Day? Recognizing the best genes in Hollywood, of course! Teens like Rumer Willis and Lourdes Leon may have famous fams, but they're making names for themselves in their own right. Take a peek at our 10 fave famous teens with fabulous genes, and don't forget to tell us your fave in the comments!