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Wanna Feel Old?! Ashlee Simpson & Pete Wentz’s Son Bronx Is 13!

They grow up so fast!

Ashlee Simpson and her ex-husband Pete Wentz are officially parents of a teenager! The exes’ son Bronx celebrated his 13th birthday over the weekend, and, of course, his momma couldn’t help gush about the milestone on her Instagram . The Pieces of Me singer posted an adorable black-and-white snapshot of herself cuddling the new teen on Sunday, reflecting:

“This is 13. Happy birthday Bronx. You are the coolest teenager. I LOVE YOU. I LOVE YOU. I LOVE YOU. ”

Adorbz!!

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While the Fall Out Boy rocker has yet to make a public post in his kiddo’s honor, lots of Ashlee’s high-profile friends shared sweet messages about the big day, including Rachel Zoe , writing:

“OMG 13”

LOLz! Similarly, makeup artist Mary Phillips simply couldn’t get over how fast time flies, adding:

“Stop!!! Omg it feels like yesterday he was within your belly”

Even Simpson’s husband and Bronx’s stepdad Evan Ross got in on the particular action, commenting:

“BRONX HAPPY BIRTHDAY KING! REALLY LIKE U”

Cute!! Bronx is the oldest associated with his parents’ children. After Ashlee and Pete broke up in 2011 , she went on to welcome 6-year-old Jagger Snow and 1-year-old Ziggy Blue with Evan. Pete also shares 7-year-old Saint Lazslo and 3-year-old Marvel Jane with his wife Meagan Camper . So , we’re sure having a teen feels like the whole new ballgame now!

Happiest of birthdays in order to Bronx!!

[Image via WENN /Avalon/MEGA & Ashlee Simpson/ Instagram ]

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