Natalia Noemi Cappuccini-Sinclair (born Natalia Noemi Keery-Fisher; 15 August 1986), better known by her stage name Natalia Kills, is an English singer and actress. She was born, and raised for part of her early life, in Bradford. As of 7 July 2015 she is now formally known as Teddy Sinclair.

Kills studied at the Bradford Girls' Grammar School before briefly attending the London Academy of Music and Dramatic Art. She withdrew from LAMDA to focus on her musical career. In 2008, record executive and producer will.i.am signed her to his label will.i.am Music Group, an imprint of Interscope Records. She released her debut album, Perfectionist, in 2011, and her second album, Trouble, in September 2013.

In 2014, she married boyfriend Willy Moon, who is also a singer on the same label. In March 2015, Kills and Moon were fired from the second season of the New Zealand version of The X Factor after their scathing remarks towards a contestant were deemed as unacceptable by broadcaster TV3.