Reese Witherspoon shares throwback photo from her middle school cheerleading days

Reese Witherspoon is throwing it back to her middle school days!

The Big Little Lies star took to Twitter on Thursday to give fans a peek at her teenage life. In the black-and-white snap, Witherspoon is all smiles as she's lifted up for a cheerleading stunt by two other girls. Clad in an adorable uniform repping her school, Harding Academy in Nashville, Tennessee, and rocking a bow in her short, curly hair, Witherspoon is certainly letting her school spirit shine through.

"Say hi to little, cheerleader Reese! #TBT," she captioned the pic, before referencing her upcoming book, Whiskey in a Teacup, which is due out on Sept. 18.

"I loved writing #WhiskeyInATeacup because I had the chance to walk down memory lane," she wrote. "I’m so proud to share with y’all where I come from and some amazing memories from my childhood."

The 42-year-old actress spoke with ET last month about reprising one of her most iconic characters, Elle Woods, in a Legally Blonde sequel. The mother of three confirmed the third movie back in June and, though she couldn't provide any details, Witherspoon teased that the flick will be "so fun."

"I got to go to a meeting the other day and we talked about all the new plot points and all the characters and some returning characters and some new characters," she shared. "...I mean I got so excited just in the meeting. I was like, 'This is going to be good.'"

Legally Blonde 3 is set to premiere on Valentine's Day 2020.

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Legally Blonde premiere 2001
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Legally Blonde premiere 2001
Actress Reese Witherspoon attends the 'Legally Blonde' Westwood Premiere on June 26, 2001 at Mann Village Theatre in Westwood, California. (Photo by Ron Galella, Ltd./WireImage)
Reese Witherspoon and Ryan Phillippe during Premiere of 'Legally Blonde' at Mann Village Theatre in Westwood, California, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
Ali Larter during Premiere of 'Legally Blonde' at Mann Village Theatre in Westwood, California, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
Selma Blair during Premiere of Legally Blonde at Mann Village Theatre in Westwood, California, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
WESTWOOD, CA - JUNE 26: Actress Katherine Heigl attends the 'Legally Blonde' Westwood Premiere on June 26, 2001 at the Mann Village Theatre in Westwood, California. (Photo by Ron Galella, Ltd./WireImage)
Actress Raquel Welch attends the 'Legally Blonde' Westwood Premiere on June 26, 2001 at Mann Village Theatre in Westwood, California. (Photo by Ron Galella, Ltd./WireImage)
WESTWOOD, CA - JUNE 26: Actor Scott Foley and actress Jennifer Garner attends the 'Legally Blonde' Westwood Premiere on June 26, 2001 at the Mann Village Theatre in Westwood, California. (Photo by Ron Galella, Ltd./WireImage)
James Marsden (Photo by Gregg DeGuire/WireImage)
Victor Garber during 'Legally Blonde' Premiere at Mann Village Theatre in Westwood, California, United States. (Photo by Ron Galella, Ltd./WireImage)
Actress Alanna Ubach attends the 'Legally Blonde' Southhampton Premiere on July 7, 2001 at the United Artists Cinemas in Southhampton, Long Island, New York City. (Photo by Ron Galella/WireImage)
WESTWOOD, CA - JUNE 26: Director Robert Luketic attends the 'Legally Blonde' Westwood Premiere on June 26, 2001 at the Mann Village Theatre in Westwood, California. (Photo by Ron Galella, Ltd./WireImage)
Olivia Hacke during Premiere of Legally Blonde at Mann Village Theatre in Westwood, California, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
Marisa Dyan during Premiere of Legally Blonde at Mann Village Theatre in Westwood, California, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
Maeve Quinlan during Premiere of Legally Blonde at Mann Village Theatre in Westwood, California, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
Hoku during Premiere of Legally Blonde at Mann Village Theatre in Westwood, California, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
Jamie Bergman during Premiere of Legally Blonde at Mann Village Theatre in Westwood, California, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
Beverley Mitchell during Premiere of Legally Blonde at Mann Village Theatre in Westwood, California, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
Andrea Martin during Premiere of Legally Blonde at Mann Village Theatre in Westwood, California, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
Thora Birch during 'Legally Blonde' Premiere at Mann Village Theatre in Westwood, California, United States. (Photo by Ron Galella/WireImage)
WESTWOOD,CA - JUNE 26: Actress Maeve Quinlan attends the 'Legally Blonde' Westwood Premiere on June 26, 2001 at Mann Village Theatre in Westwood, California. (Photo by Ron Galella, Ltd/WireImage)
Shaune Bagwell at the Premiere of 'Legally Blonde', Mann Village Theatre, Westwood. (Photo by Ron Galella/WireImage)
Chihuahua's (Photo by Gregg DeGuire/WireImage) *** Local Caption ***
Majandra Delfino (Photo by Ron Galella/WireImage)
391082 12: Actress Jessica Cauffiel attends the premiere of MGM Pictures'' 'Legally Blonde' June 26, 2001 in Los Angeles, CA. (Photo by Vince Bucci/Getty Images)
Oz Perkins during Premiere of Legally Blonde at Mann Village Theatre in Westwood, California, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
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