The proud mama took to Instagram on Sunday to share shots of her youngest child's Teenage Mutant Ninja Turtles-themed birthday bash, but she couldn't resist posting just one more pic on Tuesday—Tennessee's actual birthday.
Weekend posts included a close-up of her little boy's Ninja Turtles cake, as well as an adorable snapshot of the birthday boy holding a balloon with the phrase "Tennessee turns 4!" emblazoned across the top.
"This smile says it all!" Reese captioned the photo. "Had such a special day- celebrating this sweet little one's (soon-to-be) birthday!!! We love you so much Tennessee!!! #TimeFlies #SundayFunday."
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Today's post saw the "Legally Blonde" actress sharing a rare pic of her entire family gathered around the 4-year-old's cake.
"Celebrating our sweet Tennessee's 4th birthday last night!" she wrote. "My forever favorite #NinjaTurtle 💋🐢 #TMNT #FamilySandwich."
The blonde beauty's older children, 17-year-old daughter Ava and 12-year-old Deacon, pose alongside their mom and baby brother in the photo, which also sees Tennessee's dad, Jim Toth, smiling proudly next to his boy.
Witherspoon married Toth in 2011, following her 2008 split from Ava and Deacon's father, Ryan Phillippe.