%22Part-Time Lover%22 is a 1985 single by Stevie Wonder, from his album In Square Circle. The song reached number one on the Billboard Hot 100, R&B, dance, and adult contemporary charts. The song's simultaneous chart success made him the first artist to score a number-one hit on four different Billboard charts. It is Wonder's most recent Hot 100 number-one single to date. (With the exception of his appearance on %22That's What Friends Are For%22 which also featured Dionne Warwick ,Gladys Knight and Elton John. That song was number one for 4 weeks from January to February , 1986.) Part Time Lover also reached number three on the UK singles chart. The song featured R&B singer Luther Vandross humming at the end of Stevie's verses and on backing vocals. Stevie Wonder earned a Grammy Award nomination for Best Male Pop Vocal Performance in 1986, for the song. Wonder is noted in the liner notes of the 4-CD set %22Hitsville USA: The Motown Singles Collection Volume 2 1972-1992%22 as describing the music for the song as an ode to %22You Can't Hurry Love%22 and %22My World Is Empty Without You,%22 both by The Supremes, former Motown label mates of Wonder.