Nick Jonas celebrates 21st birthday at XS Nightclub and Botero inside Wynn Las Vegas

Nick Jonas celebrated his 21st birthday as a full family affair with his brothers and significant others. Kevin Jonas and wife Danielle, Joe and model girlfriend Blanda Eggenschwiler, along with Nick's girlfriend, Miss Universe, Olivia Culpo, celebrated the monumental evening at Botero steakhouse followed by a party in true Las Vegas style at XS nightclub.