Delilah Hamlin, the oldest daughter of Real Housewives of Beverly Hills star Lisa Rinna and actor Harry Hamlin, spent her 23rd birthday soaking up the sun in Tulum, Mexico, with longtime boyfriend Eyal Booker, 24, and stylist Natasha Colvin at the Papa Playa Project Hotel and Resort. The young model posted pictures to her Instagram account on June 11 that showed off her very toned and tanned physique.