Dialing up the sex appeal for a cause dear to her heart, Krysten Ritter appears in a new ad for PETA.

Wearing a tiny black and red one-piece, the "Don't Trust the B---- in Apartment 23" star poses with a petite pup named Mikey, a crow bar, and a busted out car window.

The caption reads, "A dog left in a hot car can die in a matter of minutes. Never turn your back on an animal in need."

In an interview with the animal rights org, Krysten shares, "I think it's something that people don't think about. It's hot outside—your car is like a fishbowl. So the light comes in, and it gets trapped, and it gets really hot in there really quickly."

Encouraging people to take action, Ms. Ritter concludes, "If you see a dog in a hot car, and you think that he's in danger or that he's been there for a while, it's good to speak up...go into whatever businesses it's parked outside of, and just raise awareness about it." Check out the behind-the-scenes video below.

Dialing up the sex appeal for a cause dear to her heart, Krysten Ritter appears in a new ad for PETA.

Wearing a tiny black and red one-piece, the "Don't Trust the B---- in Apartment 23" star poses with a petite pup named Mikey, a crow bar, and a busted out car window.

The caption reads, "A dog left in a hot car can die in a matter of minutes. Never turn your back on an animal in need."

In an interview with the animal rights org, Krysten shares, "I think it's something that people don't think about. It's hot outside—your car is like a fishbowl. So the light comes in, and it gets trapped, and it gets really hot in there really quickly."

Encouraging people to take action, Ms. Ritter concludes, "If you see a dog in a hot car, and you think that he's in danger or that he's been there for a while, it's good to speak up...go into whatever businesses it's parked outside of, and just raise awareness about it." Check out the behind-the-scenes video below.