The lovebirds (and new parents to 3-month-old baby daughter Lincoln) are the first couple to receive the honor from the animal-rights organization.
And what a group of celebs they beat out in the annual online poll.
"Fads are a dime a dozen among red-carpet regulars, but there's one Tinseltown trend that won't be fading away anytime soon: going vegetarian or vegan!" PETA posted on its website. "Whether it's to improve their health, preserve the environment, or help stop cruelty to animals, Hollywood hotties are proving that meatless meals have never looked (or tasted!) so good."
Bell has been a meatless eater since she was a teenager. Shepard went vegan in January 2012 after watching the documentary Forks Over Knives.