A magical moment for a school principal when students help her boyfriend pop the question.

FOX's Krystin Goodwin has the details:

A pep rally turned proposal going viral. Mandy Vasek is the principal of Castleman Creek Elementary in Hewitt, Texas.

She thought she was going to a school assembly last week. But her boyfriend Russ had something else in store. He dressed up as the school mascot, what looks like a wildcat.

Over 700 students and teachers in the school's gym helped Russ pop the question. Cheerleaders were rehearsing school cheers. Then all of a sudden they began chanting a new cheer.

One Mandy hadn't heard before:

(Cheerleaders) Mandy! Marry! Me!

Russ reveals himself and gets down on one knee...

She says yes! The school proposal was shared on Facebook.

Krystin Goodwin, FOX News.

Follow Krystin Goodwin on Twitter: @Krystingoodwin