The 22-year-old brunette stunner edged out first runner-up 24-year-old Miss Jamaica Yendi Phillipps and second runner-up 19-year-old Miss Australia Jesinta Campbell.
Miss Ukraine and Miss Philippines rounded out the top five. (Miss USA Rima Fakid did not advance to the Top 15).
Navarette received her crown at Mandalay Bay in Las Vegas -- during a live telecast -- from 2009 winner, fellow Latina Stefania Fernandez, while donning a blazing red asymmetrical evening gown by Sherri Hill paired with chandelier earrings and a bracelet with matching red stones, both by Diamond Nexux Labs.
"I chose a red dress because this year Mexico is celebrating 200 years of independence and this color has a lot of meaning," Navarrete explained.
Before slipping into her evening ensemble, the 2010 winner showed off her enviable figure in a purple embellished Dar Be Dar bikini.
(You'll may recall a preview of her hot bod in these racy pre-event photos rivaling the infamous lingerie images of the Miss USA contestants).
Prior to the skimpy bikini, which Dar Be Dar's designer describes as "empowering," Navarrete also wore one of the most elaborate -- and certainly the tallest -- national costumes of the night composed of a gleaming gold, peacock feather-trimmed sphere encircling her entire body that symbolized the ancient Aztec calendar.
For the nerve-racking Q&A, judged by the likes of Niki Taylor, Olympic figure skater Evan Lysacek, William Baldwin, Jane Seymour, and Criss Angel, Navarrete looked calm and collected as she answered Lysacek's question concerning the effect of unsupervised internet use on children.
Her politically correct reply, via a translator: "I do believe that the internet is an indispensable and necessary tool for the present time, and we must be very careful and watch over what our children watch and see or teenagers watch and see. And we must be sure to teach them the values that we learn as a family so that they may use the internet properly."
The memorable night also included hosts Bret Michaels and Natalie Morales, a performance by John Legend and The Roots, and choreographed dances by the 83 contestants.
Congratulations to Miss Mexico!
In related news, check out other Latina beauties who have held the covetable title of Miss Universe on celestrellas.com.