Director Quentin Tarantino and actor Jamie Foxx were also celebrated at the U.S. bash, which drew a star-studded crowd including Diane Kruger, Camilla Belle, Aaron Paul and Zachary Quinto to West Hollywood's Chateau Marmont Hotel.
Rihanna, the only woman to be honoured at the event, showed up after being branded Obsession of the Year by editors of the men's magazine.
Meanwhile, at the Aussie GQ gala in Sydney, Hemsworth was crowned Man Of The Year, singer Sam Sparro was the Man of Style, I Am Number Four actor Callan McAuliffe scooped the Breakthrough Award and Guy Sebastian was named Solo Artist of the Year.
Dance duo Pnau was honoured with the Band Of The Year title and Dark Shadows actress Bella Heathcote was Woman Of The Year.
The Desperate Housewives star was flying back to the city from a trip to the Dominican Republic, and experienced a bumpy flight home.
The plane was almost diverted as the storm, which also caused a a major blackout, took hold - but Longoria breathed a sigh of relief after she touched down safely.
In a post on her Twitter.com page, she writes, "Just got back to LA from Dominican Republic! Almost got rerouted because of the wind!!"
Longoria wasn't the only one affected by the weather - Miranda Cosgrove told her fans, "It's the windiest day in LA of all time! I had my 1st ever tumbleweed sighting!", and singer Sam Sparro adds, "In bed on the windiest night in memory. The power is out. S**t. It's like a hurricane out there."
A 4.2-magnitude quake, centred 24 miles (38.6 kilometres) northwest of downtown L.A., shook the city and several aftershocks followed.
The former Everybody Loves Raymond star Heaton quickly took to her Twitter.com page, asking fans, "Was there an earthquake in LA? My desk just shook like crazy", before adding: "Whoohoo! Earthquake LA! Life is precarious, people - carpe diem!"
Pauley Perrette was on the set of her hit series NCIS at the time of the tremors, and she updated her followers on the situation at the TV studios.
In a series of posts, she writes, "4.2 magnitude centered right here by the #NCIS stage. All is well, lots of equipment shook. Another after shock. Keeps going. It's right underneath us at #NCIS but all's well."
DeVito took the opportunity to joke, "Earthquake? Or a small dog fart? 4.2 nice adjustment", while singer Sam Sparro also felt the quake: "That was an earthquake? I thought people were doing it upstairs."