Reese Witherspoon Marvels That Son Deacon Is a '20 Year Old Man' in Birthday Tribute: 'Ray of Sunshine'

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The actress' older son steps into his 20s as she looks back at how much he's grown

<p>Reese Witherspoon/Instagram</p> Deacon Phillippe (L), Reese Witherspoon and son Deacon (R)

Reese Witherspoon/Instagram

Deacon Phillippe (L), Reese Witherspoon and son Deacon (R)

Reese Witherspoon's son is all grown up.

On Monday, the Legally Blonde star, 47, reflected on a big moment as son Deacon Phillippe turns 20.

Sharing photos of her young adult on Instagram, she wrote, "HUGE Birthday wishes to my boy @deaconphillippe !! 🎂 🎈 ☀️Actually not a boy, he is a 20 yr old man today ! 🥰"

"Deacon, you are such a ray of sunshine, love and positivity in this world," the proud mom continued. "Keep shining that wonderful light on us all! I 💗you !"

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Reese Witherspoon/Instagram Reese Witherspoon getting a hug from son Deacon in a selfie
Reese Witherspoon/Instagram Reese Witherspoon getting a hug from son Deacon in a selfie

Related: Reese Witherspoon Shares Selfies with Her Two Sons as They Soak Up the 'Last Days of Summer'

The star shares her son Deacon and daughter Ava, 23, with ex-husband Ryan Phillippe. She shares son Tennessee with ex Jim Toth.

In August, The Morning Show actress shared a carousel of photos on her Instagram that showed how she was spending the tail end of summer. In one photo, Witherspoon snapped a selfie with her 10-year-old son Tennessee as they posed by the ocean.

In another photo, the star took a selfie with Deacon, who wore a brown baseball cap and smiled with his mom. "Soaking up the last few days of summer ☀️💕🤗," Witherspoon wrote in the caption.

<p>Reese Witherspoon/Instagram</p> Reese Witherspoon and son Deacon traveling this summer

Reese Witherspoon/Instagram

Reese Witherspoon and son Deacon traveling this summer

For Mother's Day this year, the actress shared a sweet photo of herself and her three kids as they shared a quiet beach day. "Gosh, I'm lucky to be their mama 💐💗," she captioned a picture of the four of them.

The actress and Toth announced the news that they were divorcing after nearly 12 years of marriage in April, with sources telling PEOPLE that the two are focused on taking care of their family during this time.

"They love Tennessee, and this is their focus. The move from Los Angeles to Nashville was a big deal for him," the source told PEOPLE. "They don't want the divorce to affect him negatively. They will continue to co-parent amicably. There is no drama."

"They really are the best of friends and this is such an amicable decision," the source said of Witherspoon and Toth's split.

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