Reese Witherspoon wishes son Deacon happy birthday with sweet pic from their camping trip

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Proud mama alert!

Reese Witherspoon's eldest son, Deacon Phillippe, turned 13 on Sunday, and the doting mom wished him a happy birthday via a sweet Instagram photo taken during their summer hiking trip in British Columbia.

The Academy Award winner captioned the adorable shot, "#HBD to my sweet boy Deacon on this special day! You are such a ray of sunshine in all of our lives. Your sense of humor, kindness, and joy never cease to amaze me!!! I [love] you! #13"

RELATED: Reese Witherspoon Goes 'Into the Wilderness' With Look-Alike Son Deacon

Witherspoon is not shy about showering her children with love and accolades via social media, posting another proud photo of Deacon from his 6th grade graduation last spring, in addition to a sweet family photo mere weeks ago in honor of youngest son Tennessee's fourth birthday.

The 40-year-old actress shares custody of her eldest children Deacon and Ava, 17, with ex Ryan Phillippe and has Tennessee with her husband, Jim Toth. The children often poke fun of their mom's Southern roots, Witherspoon noted in a recent interview with Today's Jenna Bush Hager.

"My kids do this whole thing where they make fun of me because I'll say, 'He did do, but he didn't done do. He done did that,'" she said. "They'll be like, 'What? Why are you [saying] 'did done?' They think it's hysterical."

The Sing actress also isn't afraid to embarrass her kids on occasion, telling ET, "I think I embarrass them terribly when I try to sing Drake songs. I don't stop singing. I enjoy it."

WATCH: EXCLUSIVE: Reese Witherspoon Talks Embarrassing Her Kids With Drake Songs at TIFF 2016

For another inside look at Witherspoon's life as a loving mother, watch the clip below.

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