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By Jane Asher
Updated Oct 13, 2016 @ 12:45 pm
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Reese Witherspoon
Credit: Gregg DeGuire/WireImage

Reese Witherspoon loves to post Instagrams for all of her special occasions: from her son's fourth birthday to the 15th anniversary of her movie Legally Blonde (for which she posted an adorable "bend and snap" video). So it was no surprise when Witherspoon took to the social media platform Wednesday night to celebrate her older brother's birthday with a sweet throwback photo.

"Aren't big brothers the best!? #HBD to this guy who has the biggest smile," she captioned the snap. "Thanks for being by my side all these years I love you! (Fun fact: he also makes the BEST ribs in Nashville!) #BigBrother."

Witherspoon, who recently opened her latest Draper James storefront in Dallas, announced today that she is set to write a "southern influence" lifestyle book, that will be released in 2018. "I'm thrilled to be writing my first book with Touchstone," she said in a statement. "It's a unique opportunity for me to share funny anecdotes about my Southern upbringing and give people a glimpse into my idea of Southern living."

WATCH: Reese Witherspoon's Cutest Instagram Moments

The Walk the Line actress has found added success with her production company Pacific Standard, which released Gone Girl and Wild. Witherspoon has a few more projects coming up, including the recently completed animated film Sing, an HBO miniseries titled Big Little Lies, as well as a film adaptation of the novel Luckiest Girl Alive.