Brian Wilson — the legendary rockstar and cofounder of The Beach Boys — has died … according to a post by his children on his Instagram account.

The rockstar’s kids shared the joint statement … saying they’re at a total loss for words at his passing before adding they realize they’re the grief they feel is shared by the whole world.

They’re asking for privacy at this time and did not provide a cause of death.

While the band’s first studio album “Surfin’ Safari” didn’t perform all that well, their sophomore effort “Surfin’ U.S.A.” netted them a gold record … with the title track becoming an enduring classic.