Thai King Bhumibol Adulyadej (R) sits next to Queen Sirikit (L) during a review of the honor guard as a part of the celebration to commemorate his 81th birthday at the Royal Plaza in Bangkok on December 2, 2008. Thailand's King Bhumibol Adulyadej, world's longest-reigning monarch celebrates his 81st birthday on December 5. Getty Images logo Getty Images 12 months ago

Thai King Bhumibol Adulyadej (R) sits next to Queen Sirikit (L) during a review of the honor guard as a part of the celebration to commemorate his 81th birthday at the Royal Plaza in Bangkok on December 2, 2008. Thailand's King Bhumibol Adulyadej, world's longest-reigning monarch celebrates his 81st birthday on December 5.