Bristol Palin doesn't believe for a second that her Playgirl-posing ex, Levi Johnston, is unable to fork over the amount of child support she's seeking from him, and she's taking legal action to get answers, TMZ is reporting.

Palin, the daughter of former Republican vice presidential candidate and half-term governor of Alaska, Sarah Palin, has subpoenaed many, but not all, the places that Johnston drew paychecks over the past year to determine whether he can afford the $1,688 monthly payments laid out in court. The pair have a year-old son, Tripp. Bristol claims his take for 2009 was more than the $105,000 he has disclosed. Levi also claims that prior to 2009 he'd never made more than $10,000/year.