Elvis Presley's teenage granddaughter and her pop star boyfriend have reportedly moved in together. Model RILEY KEOUGH, 17, and RYAN CABRERA are so serious about their romance they've exchanged commitment bands and are living together in Los Angeles. Cabrera, whose past girlfriends have included Ashlee Simpson, and Keough went public with their romance in December (06) when they were spotted making out at a concert by rock covers band METAL SKOOL in Hollywood. The couple checked the band out again in February (07), and couldn't keep their hands off each other. The Presley women like to start their romances young - grandma PRISCILLA started dating Elvis when she was 14, while mum Lisa Marie married Riley's dad, DANNY KEOUGH, when she was 20.