Bristol Palin Demands Child Support From Levi Johnston

Bristol Palin - who recently proclaimed "I’m not going to have sex until I’m married" - is demanding $1,750 a month in child support from Levi Johnston. Bristol is demanding retroactive pay since the birth of their son Tripp on December 27, 2008, according to court documents filed Thursday in Alaska, TMZ reports.

Reportedly, Bristol, 19, believes Levi, also 19, has earned "in excess of $105,000 in 2009 through various media interviews and modeling related activities."

In a sworn statement, the teen mother said, "I have received limited and sporadic financial assistance from Levi." Bristol goes on to say that Levi has only given her $4,400 over the 13 months of Tripp's life: $3,000 on September 9, 2009, and $1,400 on December 19.

Levi's manager, Tank Jones, tells TMZ Levi has paid Bristol more than $10,000 since Tripp was born. Jones also says Levi does not make money from every interview he does, though he did not say exactly how much Levi has made.

Last November, Bristol filed for full legal and physical custody of Tripp.