Jermaine Jackson -- Proud Ferrari Owner Has Wages Garnished for Child Support

The very day Jermaine Jackson became the owner of a $160,000, 2009 Ferrari California ... he had his wages garnished because he was behind on his child support ... TMZ has learned.

According to official documents ... Jermaine's baby mama, Alejandra Jackson, obtained an order which allowed the government to withhold $3,750 from his wages.

Alejandra -- who has had recurring problems getting child support from Jermaine -- got the order after he fell behind. The breakdown of the $3,750 -- $3,000 for monthly support, and $750 for past due.

The garnishment order allows the government to garnish future wages as well to cover the $3,000 a month.

As we first reported ... Katherine Jackson is pissed off at Jermaine for dropping $70k in cash (he traded in his Rolls-Royce for $90k) when he couldn't pay his bills.