Jamie Lynn Spears' fiance and baby daddy Casey Aldridge has shot down reports that he cheated on the Zoey 101 star when she was pregnant with their child.

The teen actress became a teen mum in June when she gave birth to daughter Maddie.

The couple are said to be planning to wed later in the year.

But their relationship was rocked this week by tabloid claims made by Casey's ex Kelli Dawson.

She tells In Touch that she enjoyed a long-term affair with the 19-year-old  - while his girlfriend was six months pregnant with his first child.

And her story is backed up by Jamie Lynn's sister Britney's first husband Jason Alexander, who says the affair was common knowledge in their home town.

But Aldridge has denied the allegations, accusing his 28-year-old ex offabricating the story to make money.