Informal. a person who often has exaggerated or overly emotional reactions to events or situations: You're such a drama queen! You always have to have all the attention.
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British Dictionary definitions for drama queen
informal a person who tends to react to every situation in an overdramatic or exaggerated manner
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012