Madison De La Garza, aka Juanita Solis of 'Desperate Housewives,' is Demi Lovato's little sister! The girls are actually half sisters, as Demi and Madison share the same mother but have different fathers. Demi is 10 years her senior, and we're so happy that Madison has a positive, inspiring role model in her life now that Demi is working on improving her own emotional health and well being. The sister's are always interacting on Twitter, and it seems Demi seizes every opportunity to spend quality time with her little sis. Too cute!