WATCH: Julianna Margulies, Jimmy Fallon Play Musical Principals on "The Tonight Show" - NBC New York
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WATCH: Julianna Margulies, Jimmy Fallon Play Musical Principals on "The Tonight Show"

Margulies also revealed her tip for keeping a big smile on red carpets.

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    Julianna Margulies and Jimmy Fallon played two high school principals who parody popular songs for their morning announcements in a skit on Tuesday’s episode of “The Tonight Show.”

    But first, Margulies revealed the way she stays smiling in front of cameras on red carpets.

    “You always look so smiley and happy,” said Fallon, after congratulating her on her Emmy win for her role on “The Good Wife.”

    “I have a tip. It’s sort of an awkward thing to do, to walk down and smile for photographers,” Margulies said before explaining that while cameras are flashing, the actress hums “If I Only Had a Brain” from “The Wizard of Oz.”

    “It makes you look happy and relaxed,” said Margulies. “And for some reason I can’t hum any other song.”

    Finally, the two appeared in a sketch where they played high school principals that delivered their announcements to songs by Taylor Swift, Iggy Azalea, and Beyoncé.

    Watch the hilarious clip above.