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OK, is it just us or does it seem like Reese Witherspoon’s son Tennessee was just born? Turns out he’s turning 5. (Sunrise, sunset...)

Yesterday, Witherspoon took to Instagram to share a photo of Tennessee poking his head through a colorful balloon in the shape of the number five. She captioned the post, “Happy Birthday to my littlest guy, Tennessee! Everyday you bring us so much joy with your sweet smile and beautiful laugh. I love you so much! #feeling5 #HBD.”

Tennessee isn’t the only Witherspoon spawn to celebrate a birthday this month. The Big Little Lies star’s daughter, Ava Phillippe, turned 18 on September 9 and received a super-special gift from her mother: a bundle of 18 letters, one written on each birthday since the day she was born. Keep ’em coming, Reese. 

RELATED: Best News Ever! Reese Witherspoon & Jennifer Aniston Are Teaming Up for a New TV Series

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