Val Kilmer's ex-wife claims the actor has stiffed her on child support payments ... according to documents obtained by TMZ ... and now she's going after his property in order to get what she claims is rightfully owed.
Actress Joanne Whalley had two children with Val before their marriage ended in 1996 -- one of the children is now 19-years old and the other is 16. At the time of the split, Val agreed to shell out $27,500 per month in child support.
But according to court documents filed in New Mexico, Whalley claims Val has fallen behind in payment. Whalley doesn't specify how much Val owes ... but she has established a lien on Val's property to force the actor to pay up.
It ain't the first time Whalley claims Val left her hangin' -- court documents show Joanne got a lien on Val's stuff in 2007 after he allegedly stiffed her on child support payments back then.
Val eventually rectified that situation -- and the lien was removed in 2008.
We placed several calls to Val's rep for comment -- so far, no response.