"It Must Have Been Love" (IMHBL) is a pop song written by Per Gessle. It is the Swedish pop duo Roxettes's most commercially successful single and its best-charting and selling release in the United States. It rivals "The Look" as the song most closely associated with the Swedish duo.
Though not originally part of any Roxette album, that "It Must Have Been Love" was released as a single in 1990 from the soundtrack to the hugely popular film Pretty Woman ensured its success.
Also, it was a close follow-up to the group's single "Dangerous," which spent two weeks at No. 2 on the Billboard Hot 100 in February of that same year.