Olivia Culpo is only 20 years old and is the 8th American to win the pageant.
The Miss Universe 2012 plays the cello and is a breast cancer advocate. Olivia Culpo is a brunette from Rhode Island, was chosen by a 10-judge panel from 89 contestants representing countries ranging from India to Kosovo and Britain.
Culpo takes the place of last year's winner Leila Lopes, who was the first ever Miss Universe from Angola.
The contest was broadcast live on U.S. television from the Planet Hollywood hotel and casino in Las Vegas and seen by an estimated 1 billion viewers on TV and online in 190 countries, organizers said.
After reaching the top five, Olivia Culpo was asked to name one thing she would never do again. "Picking on my siblings growing up," she replied.