An Alaskan judge ordered Levi Johnston to pay $18,500 in back child support for his 13-month-old son, Tripp, on Thursday.
Johnston, 19, will also pay $1,688.42 in child support to ex fiancee Bristol Palin, TMZ.com reports.
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"Bristol is pleased with the court rulings today and looks forward to resolving the remaining issues with Levi," Palin's lawyer, Thomas Van Flein, told TMZ.
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Palin, 19, was present in court while Johnson, who most recently posed semi-nude in Playgirl, was a no-show.
According to court documents, Palin argued that Johnston earned $105,000 in 2009 -- but only paid her $4,400.
"I have received limited and sporadic financial assistance from Levi," she said in a sworn statement. Johnson's manager, Tank Jones, argued that he had paid more than $10,000.
The couple announced their split last March.