Nickelodeon has gone nuclear: Two of the network's most identifiable stars have evidently had quite a falling out, and the disharmony is playing out pretty publicly.

Josh Peck, who starred on Drake and Josh with Drake Bell between 2004 and 2007, married Paige O'Brien Saturday (June 17) in Malibu, California. And while the guest list included fellow actors like John Stamos, with whom Peck starred on Grandfathered, Bell was noticeably left off the list, and he let his followers know very clearly.

"When you’re not invited to the wedding the message is clear," he tweeted vaguely, according to Teen Voguethough the tweets were eventually deleted. In another tweet, he added: "True colors have come out today. Message is loud and clear."

Bell even noted "Loyalty is key” and “ALWAYS remember where you came from" in additional tweets captured by E! News

And fans of the former co-stars replied with devastation over the former BFFs' falling out. "omg josh not inviting drake to his wedding might be the saddest thing that happened in 2017," one wrote, while another noted "how am i supposed to sleep knowing drake & josh aren't friends?"

These Co-Stars Didn't Really Like Each Other in Real Life: