Jamie Lynn Spears' husband cheated on her??

Casey Aldridge, the father of Jamie Lynn Spears' daughter Maddie, was reportedly sleeping with another woman while Jamie Lynn was pregnant. His mistress was 28-year-old Kelli Dawson (above) and I can see the attraction. Who doesn't love a weary-looking southern belle with a scowl that could peel paint off a barn? I can almost smell her sweet Marlboro breath from here. Ahh! InTouch reports:

"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.”