Donald P. Bellisario's 90th birthday was the perfect excuse for a crossover between NCIS, JAG and Quantum Leap's biggest names. On Sunday, August 10, the TV icon toasted to nine decades of life with his family, friends and actors from his hit shows on hand to celebrate. NCIS stars Katrina Law, Sean Murray, Brian Dietzen, Gary Cole and Diona Reasonover were part of Bellisario's TV family in attendance, according to social media. The NCIS stars reunited with former castmates - and now stars of NCIS: Tony & Ziva - Michael Weatherly and Cote de Pablo.