Ester Dean

Ester Renay Dean (born April 15, 1986) is an American singer, songwriter, rapper, and record producer. Her 2009 single "Drop It Low" featured singer Chris Brown. Dean has also written or co-written songs for many artists including Christina Aguilera, Katy Perry, Keri Hilson, Beyoncé, Priyanka Chopra, Mary J. Blige, Nicki Minaj, Kelly Clarkson, Ciara, The Pussycat Dolls, Usher, Kelly Rowland, Girlicious, Rihanna, R. Kelly, Britney Spears, Selena Gomez, Soulja Boy Tell 'Em, Pia Toscano, Tinie Tempah, Lil Wayne, Machine Gun Kelly and Eurovision Song Contest 2012 winner Loreen.

source: Wikipedia