US beauty conquers Miss Universe 2012

Miss USA, Olivia Culpo, waves to the crowd after being crowned Miss Universe during the Miss Universe competition, Wednesday, Dec. 19, 2012, in Las Vegas. (AP Photo/Julie Jacobson)

Singer Pat Monahan performs during the Miss Universe pageant, Wednesday, Dec. 19, 2012, in Las Vegas. (AP Photo/Julie Jacobson)

Miss Venezuela, Irene Sofia Esser Quintero, right, reacts as a hair stylist touches up her hair with hairspray while waiting during a commercial break with Miss Australia, left, Renae Ayris, and Miss Philippines Janine Tugonon, during the Miss Universe pageant, Wednesday, Dec. 19, 2012, in Las Vegas. (AP Photo/Julie Jacobson)

Miss USA, Olivia Culpo, center, smiles for the television camera as she is congratulated by other contestants after being crowned as Miss Universe during the Miss Universe competition, Wednesday, Dec. 19, 2012, in Las Vegas. (AP Photo/Julie Jacobson)

Miss USA, Olivia Culpo, left, is crowned Miss Universe during the Miss Universe competition, Wednesday, Dec. 19, 2012, in Las Vegas. (AP Photo/Julie Jacobson)

The remaining five contestants, from left, Miss Brazil, Gabriela Markus Miss USA, Olivia Culpo Miss Australia, Renae Ayris Miss Philippines, Janine Tugonon and Miss Venezuela, Irene Sofia Esser Quintero stand together during the Miss Universe competition, Wednesday, Dec. 19, 2012, in Las Vegas. (AP Photo/Julie Jacobson)

Miss Mexico Karina Gonzalez reacts as she is announced as one of the final 16 contestants during the Miss Universe pageant, Wednesday, Dec. 19, 2012, in Las Vegas. (AP Photo/Julie Jacobson)

Miss USA Olivia Culpo steps out as she is named one of the final 16 contestants during the Miss Universe pageant, Wednesday, Dec. 19, 2012, in Las Vegas. (AP Photo/Julie Jacobson)

Venezuela's Irene Sofia Esser Quintero reacts as she is named one of the final 16 contestants during the Miss Universe pageant, Wednesday, Dec. 19, 2012, in Las Vegas. (AP Photo/Julie Jacobson)

Contestants from 89 countries stand on the stage behind hosts Andy Cohen and Giuliana Rancic at the start of the Miss Universe pageant, Wednesday, Dec. 19, 2012, in Las Vegas. (AP Photo/Julie Jacobson)