This may be hard to believe, but it’s officially been 13 years since the TV show iCarly first premiered. Yep, the Nickelodeon series aired its first episode on September 8, 2007, and fans are pretty shook over how fast time has flown by. It feels like just yesterday viewers were watching Miranda Cosgrove and Jennette McCurdy on their TV screens, and there’s not a day that goes by that they don’t miss it, TBH.

Fans may not know this, but there were actually a ton of celebrity guest stars throughout the six seasons that the show aired. Yep, stars like Nicole Anderson, Ashley Argota, Daniella Monet, Drake Bell, Victoria Justice, the members of One Direction, James Maslow, Kenan Thompson, Chord Overstreet and more made appearances on the show! Wow, who knew?

They’re not the only ones… Scroll through our gallery to uncover all the stars you totally forgot guest starred in iCarly.

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