New mom Jamie Lynn Spears' happiness is about to be destroyed by her boyfriend's ex, who insists hunky Casey Aldridge still loves her.

Pretty Kelli Dawson has opened up about her feelings for her former toyboy lover - who recently became a young father - in the pages of U.S. magazine In Touch.

In an exclusive interview, sobbing Dawson claims she and Casey, 19, were still sleeping together when Jamie Lynn, now 17, was six months pregnant with his child.

And Dawson, 28, states she and her `ex' still meet up on a regular basis: "I see him all the time, at least once a week... We still have feelings for each other. I still love him and I think he loves me."

The bombshell news comes months after infidelity rumours surrounding Aldridge began.

Dawson, who grew up in Gloster, which is close to Casey's hometown of Liberty, Mississippi claims she first met the student hunk in November 2006, while he was dating actress Spears.

She tells the publication, "We were both really attracted to each other. He totally instigated it and pursued me. His friends would tell me that he liked me, that he thought I was pretty."

Despite her better judgment, Dawson fell for Aldridge, and claims their relationship became intimate in the spring of 2007.