Reese Witherspoon [1] shared a sweet Instagram snap in honour of her youngest child, Tennessee [2], turning 7 on Sept. 26, and whoa, are they twins?! It's well-known that Reese and her oldest child, Ava Phillippe, look so much alike [3] it's scary, but now that Tennessee — whom Reese shares with husband Jim Toth — is getting a little older, it's hard to deny the resemblance he bears to his mama. (Sorry, Jim Toth and Ryan Phillippe [4], but Reese must have reaaaally strong genes!)

"Boy, this kid makes me laugh! Happy 7th birthday to my sweet boy Tennessee," Reese wrote to Tennessee on Instagram. "Here's to a day filled with chocolate cake, Beyblades, and dog cuddles!" Happy birthday, Tennessee!