Kourtney Kardashian is ready to kiss and tell.

Days after making her TV acting debut on One Life to Live, the reality star says she's still reeling over her big on-screen smooch.

"I felt like a prostitute," the 31-year-old mom admitted to Jay Leno during a Thursday appearance with sis Kim. "Like, [I was] being paid to kiss someone."

While Kardashian's beau of nearly four years, Scott Disick, helped her practice her kissing scene, the newly-minted actress says it took her a while to warm up to her OLTL costar David Fumero.

"I looked him up online," she told Leno of Fumero, who appears as bad boy Cristian Vega. "I'm like, 'I need to see this guy. Is he 99 [years-old], like, what is he?' And he's a very handsome guy. So that makes it easier."

When it came time for the big moment, Kardashian was prepared. "I probably ate a hundred mints that day," she tells Leno. "But I'm still such a prude!"

All in all, the Kourtney and Kim Take New York star was happy with how her episode turned out.

"Growing up, I would always pretend to be sick so I could stay home from school and watch One Life to Live!" she tells UsMagazine.com. "[My role] was so much fun!"

Credit: Us Magazine

Kourtney Kardashian is ready for her close-up!

On Sunday's all-new Kourtney and Kim Take New York, the reality star prepares to appear on ABC's long-running soap One Life to Live's March 28 episode.

In the above clip, she practices her lines with sis Kim and beau Scott Disick before meeting the rest of the cast. "It's like I'm watching Brad Pitt and Tom Cruise," Disick jokes as the girls recite Kourtney's scenes.

"I literally thought I would have two lines and my script is so long," Kourtney, 31, admits. "I have to kiss a guy, but I'm not an actress. I just don't feel like kissing some random guy. This is definitely a lot more than I thought I was agreeing to."

Later, the first-time actress comes face-to-face with her kissing partner, David Fumero, who plays bad boy Cristian Vega. As the pair rehearse, Kourtney -- as lawyer Kassandra Kavanaugh -- gets flustered. "I don't know any of my lines!" she cries.

Despite her jitters, once the cameras rolled, Kourtney's costars say she was a natural actress.

"[She] nailed her lines," OLTL's Kassie DePaiva says of the star, who brought 15-month-old son Mason to the set and was in and out of the November 11 shoot in New York City in just three hours. "She's welcome back anytime!"

Credit: Us Magazine

On the upcoming episode of "Kourtney & Kim Take New York," Kourtney Kardashian can't seem to remember her lines for her guest role on "One Life to Live" even though she practiced them with sister Kim. "I literally thought I would have two lines and my script is so long," Kourtney says worriedly.

Another apprehension of hers is that she has to kiss a guy, and it isn't her baby's daddy Scott Disick. "I'm not an actress. I just don't feel like kissing some random guy. This is definitely a lot more than I thought I was agreeing to." After looking up online the actor she's supposed to share a smooch with, she reacts, "There's no way I could kiss that face."

Watch Kourtney flub her lines when she gets to set, and see the rest of the drama unfold when E!'s "Kourtney & Kim Take New York" airs on Sunday night.

Credit: Entertainment Tonight (Jacki Willis)

It's lights, camera, action for Kourtney Kardashian!

On the March 28 episode of ABC's One Life to Live, the Kourtney and Kim Take New York star makes her acting debut as lawyer Kassandra Kavanaugh, who gets into an altercation at a gym and is arrested along with bad boy Cristian Vega (David Fumero).

For Kardashian, 31, appearing on the iconic daytime soap is a dream come true.

"Growing up, I would always pretend to be sick so I could stay home from school and watch One Life to Live!" she tells Us Magazine. So did her time on set live up to her expectations? "It was so much fun!" Kardashian enthuses.

Rehearsing her lines with pal Adrienne Bailon, Kardashian tells Us she did have one worry while filming: Her kissing scene with sexy star Fumero.

"That made me nervous," she confesses. "But after the kiss, he was like, 'I can't remember my line!'"

Despite her jitters, once the cameras rolled, Kardashian's costars say she was a natural actress.

"[She] nailed her lines," OLTL's Kassie DePaiva says of Kardashian, who brought 15-month-old son Mason to the set and was in and out of the November 11 shoot in New York City in just three hours. "She's welcome back anytime!"

Credit: Us Magazine

Kourtney Kardashian carries a script as she heads into the ABC studios building to film her cameo appearance on the soap opera 'One Life to Live' on November 11, 2010.

Credit: Zimbio

Kourtney Kardashian has signed on for a guest spot on One Life to Live. She will not—we repeat, not—be playing herself.

Producers of ABC's iconic soap opera are being tight-lipped about specifics, but did reveal Kourtney will appear in scenes with smokin' hot David Fumero, who plays Cristian Vega, as well as with Kassie DePaiva, who plays troublemaker Blair Cramer.

"I grew up watching One Life to Live," Kourtney says. "I hear I get into some trouble and I am looking forward to it. This may be my acting debut, but the Kardashians know a thing or two about drama."

Kourt is set to shoot her gig tomorrow. Her character's first appearance will be a very dramatic entrance alongside Cristian. The episode will air in March.

And yes, E! cameras will there to capture it all for Kourtney and Kim Take New York, E!'s upcoming second spinoff of Keeping Up With the Kardashians.

Credit: E! Online