Even stars have their fanboy and fangirl moments.
In the latest round of Orange Room Roulette, "The Fault in Our Stars" actors Shailene Woodley and Ansel Elgort and author John Green drew a question from Olivia Newton-John. Then the three proceeded to freak out.
"Is that the actual Olivia Newton-John?!" Green asked.
Yes, John, it is — the actress and singer left behind the question in the Orange Room fishbowl when she stopped by TODAY in April.
Newton-John asked: "What would you be, if not what you are now?"
"I would be Olivia Newton-John," Green answered instantaneously.
Watch the video to see what the rest of the "Fault in Our Stars" crew would do if they weren't celebs.