Miss Universe 2012 Olivia Culpo -- Planet Earth's HOTTEST Bikini Babe

Here she is ... 2012's hottest woman in the KNOWN UNIVERSE -- at least according to the Miss Universe beauty pageant -- and unless there are some really hot aliens out there, we have to agree.

Representing the Third Rock from the Sun in a sexy mixed-pattern bikini, 21-year-old Olivia Culpo stripped down on a beach in Corona del Mar over the weekend.