(CNN) - Bristol Palin is demanding Levi Johnston start paying up.
According to court documents filed Thursday in Alaska and posted on the Web site TMZ, the 19 year-old daughter of Sarah Palin is demanding the father of her one year-old son pay $1,750 a month in child support payments.
Palin is also seeking back payments beginning from late December 2008, when the child was born.
According to the court filing, Palin says Johnston made "in excess of 105,000 in 2009 through various media interviews and modeling related activities."
Palin also says she has received only "sporadic financial assistance" from Johnston over the last year - $4,400 in total.
Johnston's manager contends Palin has been paid more than $10,000 by Johnston since her son was born, according to TMZ.
Palin's attorney, Thomas Van Flein, said in a statement to CNN: "Bristol has set forth the facts regarding child support in her affidavit filed in court. The law in Alaska is clear: a parent is obligated to support his or her child. It is unfortunate Bristol has to seek court intervention in this regard."