Will.i.am -- My Ugly Car HAS RETURNED!!! [PHOTO]

Will.i.am's blindingly hideous $700,000 car is back with its rightful owner -- TMZ has learned, the rapper finally found his ride ... after it mysteriously went missing last month.

TMZ broke the story ... Will.i.am claimed the custom white sports car was stolen after he left it with the valet outside Bardot nightclub in Hollywood last month.

BUT EVERYTHING IS FINE NOW -- the above photo was snapped yesterday of the car parked safely outside Will's L.A. home.

Will tweeted yesterday that he got the car back after it was stolen, but one of his bags is still missing from the vehicle.