Question: Which of Kesha's number-one singles features Diddy?
Context: LaDonna Adrian Gaines (December 31, 1948May 17, 2012), better known by her stage name Donna Summer, was an American singer, songwriter, and painter.  She gained prominence during the disco era of the late 1970s.  A five-time Grammy Award winner, Summer was the first artist to have three consecutive double albums reach No. 1 on the United States "Billboard" 200 chart and charted four number-one singles in the U.S. within a 12-month period.  Summer has reportedly sold over 140 million records worldwide, making her one of the world's best-selling artists of all time.  She also charted two number-one singles on the R&B charts in the U.S. and a number-one in the U.K. "Imma Put It on Her" is the first single from the American R&B boy band Day26's second studio album, "Forever in a Day".  It features Diddy and Yung Joc.  Willie Taylor, Robert Curry, & Que share lead vocals, with Brian Angel and Big Mike providing ad libs. American singer and songwriter Mariah Carey has released sixty-three official singles, six promotional singles, and has made eight guest appearances.  Carey's self-titled debut album in 1990 yielded four number-one singles on the "Billboard" Hot 100, the first being "Vision of Love", a song credited with revolutionizing the usage of distinguished vocal stylings, predominantly the practice of melisma, and effectively influencing virtually every female R&B performer since the 1990s.  Subsequent singles "Emotions" (1991) and Carey's cover of the Jackson 5 classic, "I'll Be There" (1992) continued the singer's streak of US number-one singles, with the latter becoming her fourth chart-topper in Canada and first in the Netherlands.  With the release of Carey's third studio album, "Music Box" (1993), the singer's international popularity surged upon release of "Hero" and the album's third single, her cover of Harry Nilsson's "Without You", which became the singer's first number-one single in several countries across Europe. American singer Madonna has released 83 singles and 16 promotional singles, and charted with 14 other songs.  In 1982, she signed a contract with Sire Records and Warner Bros.  Records, and released her first two singles before launching her eponymous debut album.  Her first entry on the US "Billboard" Hot 100 was "Holiday" (1983), which peaked at number 16.  The following year, Madonna released "Like a Virgin", which reached number one in Australia, Canada and the US; in the latter it spent six weeks atop the chart.  The album "Like a Virgin" spawned three other top five singles: "Material Girl", "Angel", and "Dress You Up".  In 1985, Madonna released her second US number-one single, "Crazy for You", and her first UK number-one single, "Into the Groove", both from feature film soundtracks.  The following year, her third studio album "True Blue" gave her three number-one singles: "Live to Tell", "Papa Don't Preach", and "Open Your Heart".  Two other singles from the album, "True Blue" and "La Isla Bonita", were top-five hits.  In 1987, she scored another number-one single with "Who's That Girl".  The title track from Madonna's fourth studio album, "Like a Prayer" (1989), was her seventh single to top the Hot 100 chart, making her the female artist with the most number-one singles in the 1980s (shared with Whitney Houston). "Get Buck in Here" is a single by DJ Felli Fel.  It features Diddy, Akon, Ludacris and Lil Jon.  The track was released October 4, 2007. The ARIA Singles Chart ranks the best-performing singles in Australia.  Its data, published by the Australian Recording Industry Association, is based collectively on each single's weekly physical and digital sales.  In 2010, 17 singles claimed the top spot.  Nine acts achieved their first number-one single in Australia, either as a lead or featured artist: Owl City, Iyaz, Jason Derulo, Train, Kevin Rudolf, will.i.am, Taio Cruz, Bruno Mars and Eve.  Five collaborations topped the chart.  Rihanna earned three number-one singles during the year for "Rude Boy", "Only Girl (In the World)" and "Love the Way You Lie".  Mars earned two number-one singles for "Just the Way You Are" and "Grenade". "Echo" is the third single off rapper Gorilla Zoe's second studio album, "Don't Feed Da Animals".  Gorilla Zoe uses an Auto-Tune effect for this song.  The song was released on iTunes March 10, 2009 and was produced by Drumma Boy.  The official remix features Diddy and another with Ne-Yo. "Tik Tok" (stylized as "TiK ToK") is the debut single by American recording artist Kesha.  The song was produced by Dr. Luke and Benny Blanco and co-written by Kesha, Dr. Luke and Blanco.  It was released on August 7, 2009, as the lead single from Kesha's debut studio album, "Animal".  The opening line of the song came from an experience where Kesha woke up surrounded by beautiful women, to which she imagined Diddy being in a similar scenario.  The experience triggered the writing of the song which she later brought to her producer, Dr. Luke, who was then contacted by Diddy in hopes of a collaboration; he came to the studio the same day and recorded his lines and the song was completed.  According to Kesha, the song's lyrics are representative of her and based on her life; the song has a carefree message and talks about not letting anything bring you down. American singer Usher has released eight studio albums, nine compilation albums, eight extended plays, and fifty-three singles (including eleven as a featured artist).  His music has been released on the LaFace, Arista, Jive, and RCA record labels.  23 million of his albums were shipped in the United States, and sold over 43 million albums worldwide, leading to a combined 75 million records and making him one of the best selling music artists.  He also has 9 Hot 100 number-one singles (all as a lead) and 18 Hot 100 top-ten singles.  In 1994, Usher released his self-titled debut album in North America, producing three singles that had moderate chart success, and the album sold more than 500,000 copies.  His follow-up 1997 album "My Way" sold 8 million copies, becoming his breakthrough album.  It was certified six-times platinum in the US, and spawned three successful singles, including his first US "Billboard" Hot 100 number-one hit "Nice & Slow".  Usher's success continued in 2001 with his third studio album "8701".  It debuted at number four on the "Billboard" 200.  The album produced two number-one singles—"U Remind Me" and "U Got It Bad".  It has sold more than 4.7 million copies and has been certified four-times platinum in the US.  Its worldwide sales stand at over 8 million. Kesha Rose Sebert ( ; born March 1, 1987; formerly stylized as Ke$ha) is an American singer, songwriter and rapper.  In 2005, at age 18, Kesha was signed to producer Dr. Luke's label Kemosabe Records.  Her breakthrough came in early 2009 after appearing on American rapper Flo Rida's number-one single "Right Round".  Kesha's music and image propelled her to immediate success, with her debut album "Animal" premiering at the top of the charts in several countries.  She achieved 3 more number-one singles, "Tik Tok" and "We R Who We R" as a solo artist, and "Timber" as a featured artist.  At the same time, she continued to write songs for other artists, becoming respected as a songwriter. " Warrior", her second studio album, was released in 2012, and spawned her eighth consecutive top-ten single "Die Young".  "Tik Tok", at one point, was the best-selling digital single in history, selling over 14 million units internationally.
Answer: Tik Tok