September 26, 2016 02:45 PM

Reese Witherspoon/Instagram

Happy birthday to the newest member of the Mutant Ninja Turtles, Tennessee James!

Reese Witherspoon celebrated her youngest child’s upcoming fourth birthday with a Teenage Mutant Ninja Turtle-themed party over the weekend.

On Sunday, Witherspoon, 40, took to Instagram to share some photos from her preschooler’s big day. And while he officially turns 4 on Tuesday, the Witherspoon-Toth family were ready to party.

“Celebrating someone VERY special’s birthday today!!! (Two hints: he is a #NinjaTurtles fan and this is his cake…) #TMNT,” the mother of three wrote in a post, sharing an image of the themed confection.

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Later in the day, Witherspoon shared a sweet photo of her birthday boy on their doorstep holding a red balloon.

“This smile says it all! Had such a special day celebrating this sweet little one’s (soon-to-be) birthday!!! We love you so much Tennessee!!! #TimeFlies #SundayFunday,” she captioned the cute snap.

Reese Witherspoon/Instagram

Witherspoon shares her little guy with husband Jim Toth, and is also mom to her 17-year-old lookalike daughter Ava and 12-year-old son Deacon, her children with ex-husband Ryan Phillippe.

RELATED VIDEO: How Reese Witherspoon’s Marriage to Jim Toth ‘Transformed Her’

Just two weeks ago, the family celebrated Ava’s 17th birthday, and the proud mom took to Instagram to share her love for her oldest child.

“Can’t believe my baby is 17 today! I love you, @avaphillippe. You’re gorgeous heart and loving spirit never cease to amaze me! I’m so lucky the universe let me be your mother. #HBD #17DancingQueen,” she wrote.

— Blake Bakkila

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