Who knew? Nicole Kidman and Naomi Watts are Australian actresses-in-crime, but the pair were actually close mates while attending North Sydney Girls' High School in their native Down Under.

Get into the back-to-school spirit by checking out other celebrities who brushed shoulders with their industry peers in the hallways, from Cameron Diaz and Snoop to Lady Gaga and Nicky Hilton. And be sure to chime in, in the comments below, on which famous face went to YOUR high school!

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  • Nicole Kidman, Naomi Watts

    North Sydney Girls' High School (Sydney, Australia)

  • Cameron Diaz, Snoop Dogg

    Long Beach Polytechnic School (Long Beach, CA.)

  • Matt Damon, Ben Affleck

    Cambridge Ridge and Latin High School (Boston, MA.)

  • Anderson Cooper, Christian Slater

    Dalton School (New York, NY.)

  • Adele, Jessie J

    BRIT School for Performing Arts (London, UK)

  • Busta Rhymes, Jay-Z

    George Westinghouse (Brooklyn, NY.)

  • Jennifer Aniston, Chaz Bono

    Laguardia High School of Performing Arts (New York, NY.)

  • David Duchovny, John F. Kennedy Jr.

    Collegiate School (New York, NY.)

  • Lady Gaga, Nicky Hilton

    Convenant of the Sacred Heart (New York, NY)

  • Kate Hudson, Liv Tyler

    Crossroads School (Santa Monica, CA.)

  • Rachael Leigh Cook, Josh Hartnett

    Minneapolis South High School (Minneapolis, MN.)

  • Neil Patrick Harris, Freddie Prinze Jr.

    La Cueva High School (Albuquerque, NM.)

  • Sean Penn, Robert Downey Jr.

    Santa Monica High School (Santa Monica, CA.)

  • Tupac Shakur, Jada Pinkett Smith

    Baltimore School of the Arts (Baltimore, MD.)

  • Zach Braff, Lauryn Hill

    Columbia High School (Maplewood, NJ.)