Thiessen returned the favor last night, wearing a Bieber shirt to the premiere of "Horrible Bosses."
Thiessen told NYMag.com that she wasn't sure why Bieber made the choice to call out the "Saved by the Bell" character.
"I have no idea how it came about with him but I'm just trying to show the love back, that's all," she said.
Thiessen, who is currently starring on "White Collar," also identifies as a Belieber.
"Of course I am [a fan]," she said. "He's adorable."
- Justin Bieber