Britney Spears' sister Jamie Lynn has reportedly called off her wedding to the father of her daughter - months after she was forced to deny rumours of a split.

The pop star's younger sibling hit the headlines at 16 when she announced she was expecting a child with her boyfriend Casey Aldridge, who she vowed to marry.

Following the birth of their daughter Maddie Briann in June, the teen couple became the subject of fervent tabloid speculation which suggested they were living apart after Aldridge cheated on Spears.

The Zoey 101 star came forward in October to deny the persistent infidelity rumours and re-iterate her plans to tie the knot with her boyfriend.

But now the 17-year-old is said to have scrapped her plans to walk down the aisle with Aldridge once and for all - after deciding she doesn't need an official ceremony to make her happy.

A source tells U.S. magazine OK!, "The wedding's off. They are still in love, living together and very happy, but they have no plans to get married. Jamie Lynn has everything she wants and feels no need for a ring and piece of paper."

And the publication alleges that Spears has also decided to give up her acting career - so she can focus on raising her toddler.

The insider adds: "She has told friends and family she's never coming back to Hollywood. She feels that part of her life is over. Jamie Lynn enjoyed every minute of doing Zoey, but since she's had Maddie, her life has changed completely.

"She's happy being a real hands-on Southern mother and hopes to continue that for years to come with Casey right by her side. Jamie Lynn knows she needs to make a living when she grows older, so she's already discussing her career options with advisers. She wants Maddie to grow up in comfort."