It's hard to believe, but Joel Madden and Nicole Richie's son Sparrow James Midnight is already 11.
The Good Charlotte singer celebrated his son's big day by posting an adorable throwback picture of the two of them, showing Sparrow sitting on his shoulders when he was younger.
"Happy 11th Birthday to my baby boy! I love you Sparrow," the 41-year-old captioned the sweet snap.
"Here's to many more years of being best friends and me embarrassing you."
Family and fans loved seeing the rare photo of the father and son together.
"My boyz!" Joel's twin brother Benji Madden commented. "HBD Sparrow — I got lucky being your uncle you're the best dude."
"Happy birthday... can't believe he's already 11," one fan wrote.
Madden married wife Nicole Richie, 38, in 2010. They share Sparrow and daughter Harlow Winter Kate who is 12-years-old.
The pair are generally quite private about their children's lives on social media, although have been known to share the occasional sweet family picture.
"Nicole we love you and I Thank you," he wrote in an Instagram post to Nicole on Mother's Day.
"You take care of us all, and you make our house a home. And To all the moms out there holding it down for your families in these difficult times, we all say thank you and we hope you are getting all the flowers today, you deserve them."
Nicole recently posted a hilarious post about being the mum to pre-teen children, after they discovered a risqué snapchat picture of her at a bachelorette party.
"HELP!" she captioned the image of herself wearing a headband with penises on it and a cat filter on her face.
"I'm the mum of pre-teens and my past posts have come back to haunt me!"