Zak Waters is an American musician, singer-songwriter, DJ, and record producer from Los Angeles, California, also known as Pretty Sister. Waters began his music career forming the band Blueskyreality.After the group disbanded, Waters started his solo music career, releasing his debut extended play (EP), New Normal (2011).He featured on Madeon's 2012 multi-platinum single "The City", which was released on August 27, 2012 to positive acclaim, charting at No. 20 on the US Hot Dance Club Songs chart and No. 16 on the UK Dance Chart.He released his debut studio album, Lip Service, on September 9, 2013 and second EP, Now // Later on June 17, 2014 on Rostrum Records.In 2014, he released his studio cover of Ginuwine's 1996 single "Pony" to critical acclaim and released his debut EDM-produced single "Out Of My Head".He collaborated on Adventure Club's gold-certified single "Fade", which further prompted Waters to international recognition.He also collaborated on other popular singles including Adventure Club and David Solano's single "Unleash (Life In Color 2014)" and Alex Gaudino and Manufactured Superstars's 2015 single "Lights Go Out". As Pretty Sister, he has released eight singles and has featured on other artists' singles including Nause's platinum-selling single "Dynamite" and Keljet's single "Love At First Site".He featured on LDN Noise's single "Tears", which was released in August 2016.He has collaborated and produced for various other music artists including Betty Who, Breathe Carolina, Nathan Sykes, Superfruit, and JoJo, among others.