*Randy Jackson was tweetin’ mad about not being invited to witness Sunday’s Grammy tribute to his brother Michael in person.

The King Of Pop, who passed away in June, was honored with an unprecedented 3-D performance featuring Smokey Robinson, Celine Dion, Jennifer Hudson, Carrie Underwood and Usher.

Michael’s two eldest children, Paris and Prince Michael – accompanied by three of their cousins – came onstage to collect their father’s Lifetime Achievement Award and received a standing ovation from the star-studded crowd.

But Randy is upset that organizers didn’t invite the rest of the Jackson clan to witness the historic tribute.

In a series of Twitter posts, he writes, “So proud, my brother being honored… (with) the Lifetime Achievement Award. My family would love to be there but truth is, we weren’t invited.

“Let me be clear, when I said “My family” I meant my brothers, sisters & parents.”

Word has it that Jackson’s mother Katherine did accompany her grandkids to the Grammy event.