Natalia Noemi "Teddy" Sinclair (née Cappuccini; born 15 August 1986) is a British singer-songwriter and actress. She has recorded music under various aliases, most famously as Natalia Kills and Verbalicious. She is currently the lead vocalist of the band Cruel Youth, which also releases music under the name The Powder Room.

As Natalia Kills, Sinclair signed a triple joint venture recording contract with will.i.am Music Group, KonLive Distribution and Cherrytree Records to release her debut album, Perfectionist (2011). The album spawned the moderately successful singles "Mirrors" and "Free" (featuring will.i.am), with both singles certified gold by the BVMI. The same year, she co-performed with American EDM duo LMFAO on their hit single "Champagne Showers", which became her most successful recording to date. Although Perfectionist underperformed commercially, its follow up, Trouble (2013) performed slightly better in the United States. She adopted the first name Teddy in 2015 and formed her own band Cruel Youth the following year, with whom she's released the extended play (EP), +30mg (2016).

Outside of her own recordings, Sinclair has written songs for Angel Haze, Madonna, and Rihanna. She received a Grammy Award nomination in 2017 for co-writing Rihanna's single "Kiss It Better". In March 2015, Sinclair and her husband Willy Moon were fired as co-judges from New Zealand X Factor for their harsh comments towards a contestant.