See photos of Irish singer-songwriter Sinead O'Connor, best known for her 1990 hit "Nothing Compares 2 U," written by Prince.

Credit: EPA / Daniel Dal Zennaro

Irish singer Sinead O'Connor performs during the Italian television show "Che Tempo Che Fa," in Milan, Italy, on Oct. 5, 2014.

Credit: AP

This CD cover image released by Nettwerk Records shows "I'm Not Bossy. I'm The Boss," by Sinead O'Connor.

Credit: AP

Sinead O'Connor performs during the Italian State RAI TV program "Che Tempo Che Fa," in Milan, Italy on Oct. 5, 2014.

Credit: AP

Sinead O'Connor performs during the Italian State RAI TV program "Che Tempo che Fa", in Milan, Italy. on Oct. 5, 2014.

Credit: Getty Images / Fred Tanneau

Sinead O'Connor performs in Lorient, France, on Aug. 11, 2013.

Credit: Getty Images / John Sciulli

Sinead O'Connor attends the The 2011 amfAR Inspiration Gala held at the Chateau Marmont in Los Angeles on Oct. 27, 2011.

Credit: INFphoto.com

Sinead O'Connor marries Barry Herridge on her 45th birthday at 'A Little White Wedding Chapel' drive-thru in Las Vegas, Nevada. (Dec. 8, 2011)

Credit: Getty Images

Sinead O'Connor attends the Giorgio Armani & Cinema Society screening of "Albert Nobbs" at the Museum of Modern Art in Manhattan on Dec. 13, 2011.

Credit: Getty Images / Evan Agostini

Singer Sinead O'Connor makes an appearance at Borders Books to promote her new 2-CD release "Theology" on June 26, 2007, in New York City.

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