Somdet Phra Nang Chao Sirikit Phra Borommarachininat, born Mom Rajawongse Sirikit Kitiyakara on August 12, 1932), is the queen consort of Bhumibol Adulyadej, King (Rama IX) of Thailand. She is the second Queen Regent of Thailand (the first Queen Regent was Queen Saovabha Bongsri of Siam, later Queen Sri Patcharindra, the queen mother). As the consort of the king who currently is the world's longest reigning head of state, she is also the world's longest serving consort of a monarch.