Reese Witherspoon's youngest child is officially a preteen — and she celebrated by sharing a rare photo of her lookalike son.

Reese Witherspoon shared a sentimental birthday tribute to her youngest son Tennessee James, whom she shares with ex-husband Jim Toth, on Instagram on Sept. 27. Tennessee's siblings, Ava and Deacon Phillippe,

Reese Witherspoon is proudly celebrating her youngest son Tennessee’s birthday with a special message. “Happy 12th Birthday to my wonderful son, Tenn! ,” Witherspoon, 48, gushed via Instagram on Friday,

The time has come for Reese Witherspoon and the team behind the new “Legally Blonde” prequel series to find their young Elle Woods.

However, the fans have someone else in mind for this prequel to one of the best movies of the 2000s. Considering the actress who led the Legally Blonde cast has a daughter in her 20s, Ava Phillippe, many took to the comments of Witherspoon’s post to exclaim that Ava would be a great fit for the role, take a look:

Reese Witherspoon had a sweet birthday tribute for 12-year-old son Tennessee—whom she shares with ex Jim Toth—thanking him for making her "laugh everyday."

"Our search for the high school version of Elle Woods is officially ON!" Witherspoon captioned a video announcing the casting call

It's a big day for Reese Witherspoon's youngest son, Tennessee, who celebrated turning 12 years old. Of course, Witherspoon posted a sweet message to commemorate the milestone—a

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,