Will.i.am -- Does This $900k Car Belong to You???

You're looking at a one-of-a-kind ...custom built ... $900k automobile on the back of a flatbed truck in L.A. last week ... and sources tell TMZ, the owner is none other than Will.i.am.

First, let's talk about the whip ... sources connected to the vehicle tell us it was custom designed from scratch by the auto-geniuses at West Coast Customs (the people from "Pimp My Ride").

We're told the car features an aluminum interior, aluminum dashboard and aluminum door panels ... and, of course, bucket seats.

Sources tell us the total cost to build the "Dick Tracy meets the year 2047" street machine was $900k ... and the man behind the project is avid car nut Will.i.am.

In fact, the Black Eyed Peas singer already has one custom designed ride in his fleet ... an ugly, futuristic white thing ... reportedly worth somewhere in the neighborhood of $700k.

We called Will for comment -- multiple times -- but we never heard back.