Cameron Diaz played teacher by surprising a class at Stanford University, helping lead a lecture on environmentally friendly design.

Her appearance on Thursday was part of the taping for an mtvU program called “Stand-In” in which celebrities teach a class.

Diaz was a sidekick for her friend and renowned environmental architect William McDonough, a consulting professor at Stanford, according to the Associated Press.

“He’s very charismatic, captivating,” Diaz said of McDonough, who Time magazine once called “hero for the Planet.”

The “Charlies Angels” star said, “Bill is one of those people who is thinking big, but is also producing.”

Students gasped and giggled when Diaz joined the class, and later lined up to snap pictures on their cell phones with the actress.

Let’s hope the students learned something useful that day.






Related Stories: