Over the past five years, she’s played the role of Anya, a revenge demon who becomes mortal and part of the hit TV show’s "Scooby Gang."

She hasn’t had time for much else.

Her beautifully chiseled face has been transformed many times into an evil, ugly monster. She once wore a revealing bunny suit (and now signs autographs with a bunny caricature). And in one scene, her character had sex with a vampire.

Most of all, Anya annoys the living daylights out of everyone on the show (in a lovable way).

But not for much longer.

"The show is probably not going to have an eighth season - and my contract is up," she told The Post. "More than likely it’s the end of Buffy’s run, and quite frankly, it’s just time. I’ve been doing Anya for five years, so now it’s time to move on."

You can catch Caulfield - who got her start in shows like "General Hospital," "Beverly Hills 90210" and "Saved By the Bell: The New Class" - in the horror flick "Darkness Falls."

In the movie, about a spirit that has taken the form of the Tooth Fairy to exact vengeance on the town that lynched her 150 years earlier, Caulfield plays a childhood sweetheart, Caitlin. "She’s the complete opposite of Anya," said Caulfield, 29. "She’s a sexually repressed, small-town schoolteacher - with a bombshell body, but you wouldn’t know it because she hides it with layers. It’s symptomatic of what’s going on in her life."

Q: Are you sad to be leaving "Buffy"?

A: It’s been a great experience. I equate it with high school. I was glad to graduate, but I still realized that I was going to miss the people and miss that period of my life, and that’s what I will do with "Buffy."

Q: It seems you’re sticking with the sci-fi genre with "Darkness Falls."

A: I’m a ridiculous sci-fi fan. In fact, I admit it freely, [and] my manager is horrified. I just recently bought seasons two through five of "Star Trek: The Next Generation" on DVD. And I’ve watched all the episodes, half on the plane and a few of them as I was going to sleep last night. There’s something about sci-fi that’s comforting.

Q: Craziest fan experience?

A: I was in London during my first sci-fi convention for "Buffy," and I was at the local bar, having a drink, writing in my journal, and this woman came up to me and said, "Do you want a drink?" I said, "No, thank you." She pushed it a couple of times, and each time I said, "No, really I’m fine." Then she turned really cold, looked at me and said, "Someday these conventions will be your only outlet." I was like, wow, thanks, peace out, OK.

Q: Did you ever get to keep the clothes on "Buffy"?

A: No. I’m sort of a klepto. Actually I’m a huge klepto, but I’m very honest about it. I’m blatantly like, "I’m stealing this," or when I’m trying on something, I’m like, "Oh well, that’s probably going to disappear," and then it disappears and they know it.

Q: What’s your personal style?

A: I have many different personalities, so I have a variety of tastes. I am most comfortable in a really cool pair of jeans, a wife beater or a sweater, and a leather jacket, fitted. Sometimes I like to feel sexy and conservative with a longer skirt and high boots. I’m not a layers person at all. I like simple lines.

Q: Favorite designers?

A: Calvin Klein, Yves Saint Laurent.

Q: What do you use to accessorize?

A: I have a ton of vintage jewelry. My aunt has an amazing antiques store, Les Belles, in San Diego. She has amazing estate jewelry.

Q: Last splurge?

A: I got this vintage leather tan jacket from LoFi, this great store in L.A. where every piece of clothing is insane quality, not racks and racks of stuff. Every item has some sort of file, either they’ve been photographed or they have some kind of history. I paid $700 for my jacket. I put it on and it fit like a glove.

Q: Most prized possession?

A: My cats. Bjorn and Brian Dennehy. They’re Abyssinian. They’re amazing, they’re really like dogs. I actually went to a psychic once, and she said, "You have two cats." And I said, "Yes, I do." And he said, "Yeah, there’s one in particular, he’s brown, he’s a deep thinker, that cat." So every time I see Bjorn staring into the fire, I’m like, "Are you having deep thoughts, Bjorn?"

Q: What would you never wear?

A: Polka dots.

Q: Do you follow a special diet?

A: No. Particularly now. I’ve had some stressful events in my life and lost a lot of weight. I’m not consciously trying to lose weight, but I just started seeing a nutritionist.

Q: What gives you substance?

A: Believing in something. Believing in faith, somebody - a friend, boyfriend. Just really trying to stay focused on things in the universe.

Q: Whose style do you most admire?

A: Nicole Kidman. I would like her to win [an Oscar].

Q: What was your most embarrassing fashion moment?

A: Walking into the mall with my skirt tucked into my tights, in the back.

Q: What would you love to own, but would never buy for yourself?

A: A big diamond necklace. A single, fat diamond.