jermaine jackson & ferrari*As TMZ put it, Jermaine Jackson may have put the cart before the Ferrari … er … horse, that is.

In other words, he went out and purchased the ultra-expensive carriage while the MJ jury was deciding whether to give his family as much as $40 billion.

Jermaine went to Calabasas Luxury Motorcars Monday to pick up the 2009 Ferrari California, which was listed at $169,995.  Sources connected to Jermaine tell us he was able to wheel-and-deal the dealer down to the low 160s.

Jermaine didn’t have to plunk down the entire amount.  He traded in his Rolls Royce and got around $90k.  We’re told he paid the balance — just over $70k.

As has been reported … if Katherine would have won her lawsuit against AEG, Jermaine and her other children would likely have been the beneficiaries of the judgment once she died.  But we know now that didn’t work out.