Question: Which American singer that performed and co-wrote "Into You" collaborated on "My Favorite Part" with American rapper Mac Miller?
Context: "Donald Trump" is a song by American rapper/singer Mac Miller, and the only song released as an official single from his mixtape "Best Day Ever".  The melody, which is played throughout the song, is taken from "Vesuvius" by Sufjan Stevens.  The music video to the song was uploaded to YouTube on March 3, 2011, while the single was released digitally on May 17, 2011.  "Donald Trump" is also incorrectly included as a bonus track on the track list of some versions of Mac Miller's debut album "Blue Slide Park".  Miller himself confirmed that the song does not feature on the album.  The song was dedicated to the American business magnate Donald Trump, who, five years after the song's release, was elected as the 45th President of the United States.  During Trump's 2016 campaign, the song regained popularity, hitting #28 on the iTunes Charts on November 9, 2016, the day after he was elected president.  However Mac Miller has personally stated in an interview that he was not a supporter of Trump. Delusional Thomas is the tenth mixtape by American rapper Mac Miller, released under the alias Delusional Thomas.  The mixtape was released as a free digital download on November 1, 2013 via a newly created website Delusionalthomas.com.  "Delusional Thomas" was entirely produced by Miller under his production alias Larry Fisherman, except for "Bill" was co-produced by randomblackdude.  The mixtape features guest appearances from Earl Sweatshirt, Bill, and Da$H. Blue Slide Park is the debut studio album by American rapper Mac Miller.  It was released on November 8, 2011, by Rostrum Records.  In July 2011, the title was announced in which the album was named, after a section of Frick Park (which was known as "Blue Slide Park") in Pittsburgh.  The park section is at the corner of Beechwood Blvd and Nicholson Street, which is just two blocks from Taylor Allderdice High School where Miller attended.  The album cover was designed by his older brother Miller McCormick and Redtape Design. Best Day Ever is the fifth mixtape by American rapper Mac Miller.  This mixtape was released online March 11, 2011.  Over 20,000 viewers joined Miller for a live video stream just prior to releasing the tape.  The mixtape consists of 16 songs produced by nine producers (predominantly ID Labs). On and On and Beyond is the debut extended play by American rapper Mac Miller.  It was released digitally on March 29, 2011.  The tracks "Another Night", and "Live Free" were previously released on Mac Miller's 2009 mixtape "The High Life", while "Life Ain't Easy", and "In the Air" are taken from 2011's "Best Day Ever".  The EP entered the US "Billboard" 200 on April 16 2011 at number 55 on the chart. Macadelic is the seventh mixtape by American rapper Mac Miller.  It was released online via free digital download on March 23, 2012.  It includes the hit single "Loud".  Mac Miller went on The Macadelic Tour in support of the mixtape in the Spring of 2012.  He performed at 18 shows in the United States and 3 in Europe.  Since its release, it has been viewed over 2,327,719 times, downloaded over 1,059,598 times, and streamed over 616,551 times from the official host of the mixtape, DatPiff.com. "My Favorite Part" is a song by American rapper Mac Miller, featuring guest vocals from American singer Ariana Grande.  It was released as the third single from Miller's fourth studio album, "The Divine Feminine" (2016), on September 9, 2016.  It is their second official collaboration after 2013's "The Way", however Miller was also featured on a remix of Grande's "Into You" also in 2016.  A music video was released on December 12, 2016 on Miller's YouTube channel. "Into You" is a song by American singer Ariana Grande from her third studio album "Dangerous Woman" (2016).  Grande co-wrote the song with Savan Kotecha, Alexander Kronlund, and its producers Max Martin and Ilya Salmanzadeh.  The song was made available by digital download on May 6, 2016 via pre-order of the album and was later serviced to contemporary hit and rhythmic radio on June 28, 2016 as the album's second single.  "Into You" is a dance-pop song, with elements of EDM and it features "a thudding disco beat, lurking synths and sharp clicks" in its instrumentation. Watching Movies with the Sound Off is the second studio album by American rapper Mac Miller.  The album was released June 18, 2013, by Rostrum Records in the United States.  The album continues his changes in his musical sound that he began with the mixtape "Macadelic".  Mac Miller has described the album as very introspective and very personal.  The album features guest appearances from Earl Sweatshirt, Ab-Soul, Action Bronson, Schoolboy Q, Jay Electronica and Tyler, The Creator among others.  Production was handled primarily by Miller himself (under the pseudonym Larry Fisherman) among others such as Diplo, Tyler, The Creator, Flying Lotus, The Alchemist, Clams Casino, Earl Sweatshirt, J. Hill, Chuck Inglish and Pharrell Williams. The discography of American rapper Mac Miller consists of four studio albums, two extended plays, eleven mixtapes, sixteen singles (including five as a featured artist), one promotional single and twenty-nine music videos. Miller began his career in 2007 as a member of the hip hop group The Ill Spoken before deciding to pursue a solo career.  Following the release of several solo mixtapes, Miller signed to independent record label Rostrum Records in 2011.  His debut extended play "On and On and Beyond" was released in March 2011, peaking at number 55 on the United States "Billboard" 200 albums chart.  Miller's single "Donald Trump" became his first singles chart entry, peaking at number 75 on the US "Billboard" Hot 100 and later earning a gold certification from the Recording Industry Association of America (RIAA).
Answer: Ariana Grande