In Touch Weekly has snagged an exclusive interview with the 29-year-old mistress of Casey Aldridge, perhaps best known as Jamie Lynn Spears’ ‘baby daddy.’ Kelli Dawson say she has been having sex with Jamie Lynn’s better half since the Spring of 2007-and their sexual relationship was still on-going during the teen’s recent pregnancy.

Casey welcomed a daughter, Maddie, with Jamie Lynn in June.

“I see him all the time, at least once a week,” Kelli tells the In Touch.

In Touch writes: 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.”

“You never knew if they were broken up or not, because it changed from day to day!” the Other Woman unashamedly says of Casey’s relationship with Jamie Lynn.