Hey M Girls!
It looks like this Nickelodeon cutie wasn't too excited for school! He tweeted: "#tbt #idontwantogotoschool" along with this adorable pic!
Here's a hint: before his character became a pop star, he was a hockey player!
Scroll down for the big reveal...
It's Big Time Rush's Carlos Pena!
Did you guess correctly? Tell us below!
Photos Courtesy of Carlos Pena's Instagram