McDermott has missed multiple payments on their $1,500-a-month agreement, and his furious ex, Mary Jo Eustace, is hauling him back to court.
Since January 2016, Spelling and McDermott have lately suffered a series of major financial struggles.
The source says that Eustace had been warned that the August payment would be late.
Dean was paying their son Jack’s first-month rent, security deposit and several other college expenses.
The source says that a payment was made to Eustace on Friday.
According to Eustace, after skipping the payments, Spelling and McDermott took their kids on a luxurious vacation to the Four Seasons in Punta Mita, Mexico.