Seeks $18,000 from her baby's Playgirl model daddy

Bristol Palin and Levi Johnston‘s child custody case is proving to be a messy one. Citing an Alaska law that declares that “the duty of parental support begins on the date of the child’s birth,” Bristol, the daughter of former vice presidential candidate Sarah Palin, claims in court papers that Levi should be required to pay 20% of his annual income in child support. Bristol demanded $1,750 a month from Levi and an award of “unpaid child support” in the amount of $18,350. This sum was based on the belief that Levi made in excess of $105,000 in 2009 through various media interviews and modeling related activities – most famously for Playgirl last month. She claims that in the 13 months that their son, Tripp, has been alive, Levi has only given her $4,400. –KADEEN GRIFFITHS