Brandy & Monica - The Boy Is Mine

Release date: 1998 
The song's lyrics tell a story about two women disputing the love of a man and were inspired by Paul McCartney and Michael Jackson's 1982 duet "The Girl Is Mine".
"The Boy Is Mine" was the first number-one pop record for both artists, both stateside and internationally. The song became one of the most successful records of the year, spending a record-breaking thirteen weeks on top of the U.S. Billboard Hot 100 during the Summer of 1998, and it reached the top five on most of the other charts on which it appeared.
Album: Never Say Never