Jamie Lynn Spears doesn't just have teenage pregnancy on her mind right now. The 16-year-old sister of Britney apparently also has a cheating baby-daddy to her list of worries.

National Enquirer reports that Casey Aldridge isn't the good quiet boy everyone thinks him to be. He had allegedly cheated on the Zoey 101 star a number of times even before she announced her pregnancy.

"I think Casey is a serial cheater who has lied to Jamie Lynn and betrayed her time and time again," a source admits. "Even though I'm sure she knows in her heart that Casey's a lying, cheating dog, Jamie Lynn is head over heels in love with him. She continues to take him back regardless of how awful he treats her."

The source adds that Spears is not the only girl Aldridge got pregnant. "This past spring Casey was forced to tell Jamie Lynn that he'd cheated on her and gotten that girl pregnant. Jamie Lynn was devastated. She swore Casey out of her life forever."

But that forever didn't last as two weeks before the other girl miscarried, Spears was back in Aldridge's arms.

"In fact, only a few months before getting that girl pregnant, Casey had cheated on Jamie Lynn by dating another girl, Whitney Seals of Magnolia, Miss."

"Whitney and Casey have been dating for months," Kevin Seals, Whitney's brother, confirms. "I know Jamie Lynn was really upset and jealous when she found out about it."

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