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Comedian and actor Brand - who has been meat free since he was 14 - and the 37-year-old Bridesmaids star topped the annual poll by People for the Ethical Treatment of Animals (PETA).
Congratulating the winners, the PETA website stated: "These sexy veggie-loving celebs have captured the hearts of many with their comedic charm and compassionate choices.
"Both of these hilarious hotties know that there's nothing funny about the abuse endured by animals raised for food on factory farms. These sexy stars prove that being vegetarian helps a person shine from the inside out."
'Fish are lovely little guys'
When once asked by a TV host if he used fish oil as a way of staying alert, Brand, 36, quipped: "I'm vegetarian. I think it's cruel to squeeze oil out of a fish - because they're lovely little guys, aren't they?
"You shouldn't eat animals; it's mean to them!"
Wiig is also a devout vegetarian, and keeps to a strict diet, although she allows herself one day a week to indulge, and loves to eat Dark Chocolate Peanut M&Ms, lemon cupcakes, and "hot, melted cheesy sandwiches."
She explained: "I eat a lot of tofu and soy. I drink a lot of water, and I'm addicted to cranberry juice.
"I do have a splurge day once a week when I can eat whatever I want. It's good, because it helps you stay on track the rest of the week."
Brand and Wiig replace last year's winners, actress Olivia Wilde and celebrity fitness trainer Bob Harper.
