Mariah Carey made an unexpected appearance on her son’s Twitch live stream … and the poor kid was mortified in the hilarious moment!

The 13-year-old Moroccan, AKA “Rocky,” was chopping it up with his fans on Twitch … when his sister Monroe showed up in the background — followed by his superstar mom.

Needless to say, everyone on his stream went nuts when they saw Mariah … with several asking “Ms. Carey” to stick around and hang.

For those unaware, Rocky and Monroe are the twins Mariah shares with Nick Cannon — part of Nick’s LARGE family tree.

Odds are Rocky will lock the door next time before he is ready to game on!