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Do you know Gaga's real name? When her birthday is? Or maybe even how many tattoos she has? Put your knowledge to the test with ten must-know facts about 'Applause' singer and Jingle Bell Ball star Lady Gaga.
Her real name is Stefani Joanne Angelina Germanotta and she is 5' 1" (1.55 m) tall.
Lady Gaga was born in New York City on March 28, 1986, making her 27.
Lady Gaga taught herself how to play piano she was just four years old, by ear. She wrote her first song when she was 13 and began performing at open mic nights when she was 14. Picture: Wenn
She got the stage name Lady Gaga from one of her producers, Rob Fusari. During a text conversation Rob texted her the Queen song "Radio Gaga" but somehow autocorrect changed "Radio" to "Lady" and she adopted the name from there.
Lady Gaga signed her first major label deal with Def Jam Recordings when she was 19. She was dropped three months later before eventually signing for Interscope Records on her 20th birthday. Her debut single "Just Dance" went straight to number one and the rest, as they say, is history.
She once ordered $1000 worth of pizza for her fans, whom she calls her 'Little Monsters', when she saw a crowd of them queueing for one of her album signings.
She attended to the same high school as Paris and Nicky Hilton, the Convent of the Sacred Heart, an all-girls Catholic High School in the heart of New York City, USA.
Lady Gaga has 14 tattoos, all on the left-hand side of her body. She revealed that she promised her Dad to keep the right-hand side of her body "slightly normal".
Lady Gaga has been declared bankrupt 4 times, most recently after her Monster's Ball tour left her in $3m debt. However, Forbes now estimate her earnings, just in the last 12 months, to be over $80m.
While no official tour dates have been announced yet, Lady Gaga is performing at the 2013 Jingle Bell Ball on Sunday 8th December at London's O2 Arena. She previously performed at the 2008 Jingle Bell Ball and recently announced she'll be the first artist to perform in space in 2015.