Question: Whose 2010 single was co-written by the "Drop It Low" artist?
Context: "Your Time Will Come" is a 2010 single release by Scottish recording artist Amy Macdonald, released as the fifth single from her second studio album "A Curious Thing" (2010).  It was the first time one of her singles had failed to chart anywhere in Europe. "This Pretty Face" is a 2010 single release by Scottish recording artist Amy Macdonald, released as the third single from her second studio album, "A Curious Thing" (2010).  The single was released on 19 July 2010. American hip hop recording artist J. Cole has released four studio albums, one live album, one compilation album, two extended plays, three mixtapes, sixteen singles (including nine as a featured artist), two promotional singles and twenty music videos. J. Cole first took up rapping in his teens, collaborating with the local Fayetteville hip hop duo Bomm Sheltuh. " The Come Up", his debut mixtape, was released on May 4, 2007 to positive reception.  Following the release of "The Come Up", J. Cole was contacted by American rapper Jay Z and subsequently signed to his record label Roc Nation.  Cole released his second mixtape "The Warm Up" on June 15, 2009.  "Lights Please", the first single from "The Warm Up", peaked at number nine on the United States "Billboard" Bubbling Under R&B/Hip-Hop Singles chart and became Cole's first entry on a national record chart.  He was later featured on "All I Want Is You", a 2010 single by American R&B singer Miguel – it peaked at number 58 on the US "Billboard" Hot 100.  J. Cole's third mixtape "Friday Night Lights" was released on November 12, 2010. Jessica Colotl is an undocumented immigrant to the US whose 2010 arrest for driving without a license and possible deportation called attention to the issue of illegal immigration.  Colotl (born c. 1989) was brought from Mexico by her parents illegally into the United States of America when she was either 10 or 11 years old.  Colotl became the center of debate over immigration policy, including the enrollment of non-citizens in state universities and discussion of Immigration and Nationality Act Section 287(g) which allowed police to turn her over to immigration enforcement. Krista Branch is an American singer whose 2010 song "I Am America" has been called the anthem of the Tea Party movement.  Branch produced "I Am America" with her husband, who wrote the song, to protest the treatment of the Tea Party by Democrats.  After being uploaded to YouTube, the song was aired on Glenn Beck's radio show and it quickly grew in popularity.  It was subsequently performed on Fox News and at events across the country.  A former "American Idol" contestant, Branch was eliminated early in the process. Best Kept Secret is a 2010 single release by Norwegian recording artist Didrik Solli-Tangen, released as the second single from his first studio album "Guilty Pleasures" (2010).  The song features the Norwegian trumpet soloist Tine Thing Helseth. Esther Renay Dean (born April 15, 1982), known professionally as Ester Dean, is an American singer, songwriter, record producer, and actress.  Her 2009 single "Drop It Low" featured singer Chris Brown.  Dean has also co-written songs for many artists including Christina Aguilera, Florence + The Machine, Katy Perry, Beyoncé, Nicole Scherzinger, Priyanka Chopra, Mary J. Blige, Nicki Minaj, Kelly Clarkson, Ciara, The Pussycat Dolls, Usher, Kelly Rowland, Girlicious, Keri Hilson, Rihanna, R. Kelly, Britney Spears, Melody Thornton, Vanessa White, Kevin McHale, Selena Gomez, G.R.L., Soulja Boy Tell 'Em, Little Mix, Pia Toscano, Tinie Tempah, Lil Wayne, Machine Gun Kelly, Fifth Harmony, and Eurovision Song Contest 2012 winner Loreen. "Firework" is a song by American singer Katy Perry from her third studio album, "Teenage Dream" (2010).  Perry co-wrote the song with Ester Dean and its producers StarGate and Sandy Vee.  It is a dance-pop self-empowerment anthem with inspirational lyrics, and Perry felt it was an important song for her on "Teenage Dream".  Capitol Records released it as the album's third single on October 26, 2010. "Scream" is a song by American recording artist Usher, released through RCA Records, as the second single from his seventh studio album "Looking 4 Myself" (2012).  It was written by Usher, Savan Kotecha, Max Martin and Shellback, with production handled by the latter two.  The song premiered on the internet on April 26, 2012, and was released the following day as a digital download.  "Scream" is primarily a synthpop and dance-pop track.  Critics compared its musical structure to that of Usher's 2010 single "DJ Got Us Fallin' in Love", which was also co-written by Martin, Kotecha, and Shellback.  "Scream" was noted to contain heavily sexual overtones within its lyrics. "Love Love" is a 2010 single release by Scottish recording artist Amy Macdonald, released as the fourth single from her second studio album, "A Curious Thing" (2010).
Answer: Katy Perry