"Return the Favor", featuring Timbaland, served as the second international single from Hilson's "In a Perfect World..." album, while "Turnin Me On" featuring Lil Wayne, was released as the second US single. The latter achieved commercial success, reaching number 15 on the "Billboard" Hot 100, and number two on the Hot R&B/Hip-Hop Songs chart, eventually being certified platinum in the United States. "Turnin Me On" spent 10 weeks on the Hot 100. Hilson and Lil Wayne performed the song on "Jimmy Kimmel Live!" on March 27, 2009. The next single, "Knock You Down" featuring Kanye West and Ne-Yo, achieved more success, reaching number three on the "Billboard" Hot 100 and number one on the Hot R&B/Hip-Hop Songs chart, eventually being certified two times platinum. The song spent 31 weeks on the Hot 100 and 30 weeks on the Hot R&B/Hip-Hop Songs chart. It also reached the top ten in Canada, Ireland, The Netherlands, New Zealand and the United Kingdom. Hilson and West performed "Knock You Down" on the "Late Show with David Letterman" on May 4, 2009. "Make Love", "Slow Dance", and "Change Me" featuring Akon, were released as the album's fourth, fifth and sixth US singles, respectively. Hilson performed "Slow Dance" with The Roots on "Late Night with Jimmy Fallon" on September 18, 2009.