Bristol Palin Demands $1,750 a Month Child Support From Levi Johnston

Credit: Eugene Gologursky/; Jeff Kravitz/FilmMagic

Bristol Palin is demanding $1,750 a month in child support from Levi Johnston, retroactive to the birth of son Tripp on Dec. 27, 2008, according to court documents filed Thursday in Alaska. reports that Bristol, 19, believes Levi, also 19, has pulled in "in excess of $105,000 in 2009 through various media interviews and modeling related activities."

In a sworn statement, she said: "I have received limited and sporadic financial assistance from Levi."

She states that he has only given her $4,400 over the 13 months of Tripp's life: $3,000 on Sept. 9, 2009, and $1,400 on Dec. 19.

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

Around the same time, former Alaska Gov. Sarah Plain told Oprah Winfrey that Levi still "is a part of the family ... I think he needs to know that he is loved and he has the most beautiful child and this can all work out for good."