(L-R) HRH Princess Srirasm, Prince Dipangkorn Rasmijoti, Thai Crown Prince Maha Vajiralongkorn and Princess Bajrakitiyabha walk behind Thailand's King Bhumibol Adulyadej (unseen) as he leaves from Siriraj Hospital to the Grand Palace in Bangkok December 5, 2011. Thailand's king, the world's longest reigning monarch, left the hospital where he has been staying for more than two years and addressed his subjects to mark his 84th birthday. AFP PHOTO / Pairoj (Photo credit should read PAIROJ/AFP/Getty Images)
