Meet Kelli Dawson, the disturbed 28-year-old woman who was sleeping with Casey Aldridge — when Casey was only 17 — and still sees him, she says.

“I see him all the time, at least once a week,” she tells InTouch.

The pair first met in November 2006, at the home of her sister, Kim Toller. At the time, Casey was already dating Jamie Lynn, but the sexual chemistry between Casey and Kelli was instant. “We were both really attracted to each other,” Kelli reveals. “He totally instigated it and pursued me. His friends would tell me that he liked me, that he thought I was pretty.” The couple saw each other a few times and “kissed randomly,” but it wasn’t really “hot and heavy,” Kelli admits, until the spring of 2007. Though Casey and Jamie Lynn were still involved, Kelli insists, “You never knew if they were broken up or not, because it changed from day to day!”

The pair didn’t bother to hide their relationship. “Kelli and Casey have been a couple on and off for a few years,” confirms Jason Alexander, Britney Spears’ first husband and a native of nearby Kentwood, La. “They were a really tight couple, but I think it was hard for Kelli, having Jamie Lynn in the picture.”

Kelli says she and Casey stopped sleeping together a few months before Jamie Lynn gave birth to their daughter, Maddie. “It just didn’t feel right,” she explains. “He had to deal with the baby coming, and it had to stop.” She says the last time the couple had sex together was in March but “even after we stopped having sex, we would still kiss occasionally.”

Ew, I’m sorry, but if they’ve been together for “a few years,” that means that when they started dating, she was, like, 25 and he was around 16.

Ew, ew, ew, ew.

This girl is so disturbed. What kind of 25-year-old woman wants to date a 16-year-old boy? Not only is it mildly illegal, it’s also really gross and disturbing. I mean, even today, I look at college guys and I’m like, “Ew, they’re so young!” (one exception is Michael Phelps, of course), and at least those guys are LEGAL.

And then to talk about it in front of a national audience???

What do you think InTouch paid her for this interview? $10K? $20K?

Was it worth it, dear?