Reese Witherspoon Shares Rare Photo of 'Wonderful' Youngest Son Tennessee on His 12th Birthday

Reese Witherspoon's baby boy is all grown up!

The Legally Blonde actress' youngest son, Tennessee James Toth, has officially marked his final year before he reaches his teens. His proud mother marked the occasion with a rare photo of her youngest child, whom she shares with ex-husband Jim Toth.

In a new snapshot uploaded to Instagram on Friday, Sept. 27, the mother-son duo sat in what appeared to be the booth of a diner, with the young man sitting up straight and smiling widely while his mom leaned her head down on top of his with a blissful grin.

"Happy 12th Birthday to my wonderful son, Tenn! 💙," she wrote alongside the sweet pic. "I'm so lucky to have your joyful, curious, hilarious spirit in my life making me laugh everyday. I love you, buddy 🥰."

Tennessee is Witherspoon's third child and the only one she shares with Toth. She also has a 25-year-old daughter, Ava, and a 20-year-old son, Deacon, with her ex-husband, Ryan Phillippe.

Related: Reese Witherspoon Makes Rare Red Carpet Appearance With Grown Lookalike Son and Daughter

Ava and Witherspoon are frequently seen "twinning," thanks to their near-identical appearances. The two had fans doing a double-take this past spring when they attended the Tiffany & Co. Celebration for the launch of Blue Book 2024: Tiffany Céleste. The mother-daughter duo wore dark dresses with a bold, chunky necklace and a black clutch purse, with Ava's visible tattoos serving as the only real differentiation between the two.

Ava recently marked a major birthday, too, proving how fast "time flies," while Deacon will mark turning 21 next month.

Next: Reese Witherspoon's Daughter Ava Says It's 'Time to See How the Other Half Lives' as She Rocks Dramatic Hair Transformation