Miss Universe 1991, the 40th anniversary of the Miss Universe pageant, was held on May 17, 1991 at the Aladdin Theatre for the Performing Arts in Las Vegas, Nevada, United States.Lupita Jones of Mexico crowned by Mona Grudt of Norway.Seventy-three contestants competed in the 1991 Miss Universe pageant.Average Order of Announcements Top 10 Top 6 Top 3 The following table is the order of introduction in the Parade of Nations segment in the regional groups, randomly-ordered.Last competed in 1952: Last competed in 1978: Last competed in 1984: Last competed in 1985: Last competed in 1986: Last competed in 1987: Last competed in 1988: Last competed in 1989: