SIMON COWELL NEVER looks a gift horse in the mouth, but when he suddenly started receiving wedding gifts and congrat cards, even though he and galpal TERRI SEYMOUR had NOT tied the knot, he investigated and – just as he’d suspected – a mixup had occurred.

The other “Idol” Simon, Brit show creator SIMON FULLER, had just gotten hitched in California, and that got some business associates confused.

So, will he return the gifts? HEY…this ain’t “Simple” Simon!

Judge Cowell cracked to pals that if people are dumb enough to send him wedding gifts, he’s smart enough to keep ’em!