Jamie Lynn Spears, Britney's little sister, has reportedly called off her expected wedding to the father of her daughter, just months after she denied gossip of a breakup. The singers younger sister hit the headlines at age 16 when she announced she was expecting a child with her boyfriend, Casey Aldridge, who she swore she was going to marry. Following the birth of their daughter, Maddie Briann, last June, the very young 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 rumors and to re-iterate her plans to tie the knot with her beau. But now the 17-year-old is said to have canned her plans for marriage with Aldridge once and for all after deciding she doesn't need an official ceremony to make her happy. A source tells OK!, "The wedding's off. They are still in love, living together and very happy, bu...