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Tula Paulinea "Tulisa" Contostavlos (born 13 July 1988) is an English singer-songwriter and actress. She is of Greek and Irish descent. She is best known for being a member of the Camden-based hip hop group N-Dubz. She is in the band with her cousin Dappy and their friend Fazer. Contostavlos was a judge on the eighth series of The X Factor. She mentored the "Groups" category. They included Little Mix, the only group to win the competition.