Giving fans a glimpse at baby JT back in the day, the singer posted a throwback picture of himself and his mum - Lynn Harless - to wish her a happy birthday.
Crediting his mum as his "first partner in crime", Justin had us all aww'ing with his special message to his nearest and dearest.
In the heart-melting picture, Justin can be seen sporting his swimming shorts and playing on the beach while his mum is sunbathing next to him.
Alongside his photo, the 33-year-old wrote: "Happy Bday to my first partner in crime and the FIRST QUEEN OF THE HOUSE.
"We have been through so much together and I love you more than words can begin to describe. Everything I am and continue to strive to be is because of you. I love you, Momma! #UandMeVsAnybody."
How sweet is that?!
Although his mum isn't the only special lady in his life, as Justin is married to actress Jessica Biel and it has recently been rumoured the couple are expecting!
According to US reports, Jessica is pregnant with the pair's first child, but both she and Justin are yet to confirm the news.
Known for being notoriously private, it's unsurprising the couple have chosen not to comment on their baby news. However, Justin's former bandmate Joey Fatone has since suggested such reports are true.
Hinting Justin and Jessica do have a little one on the way, he told InTouch magazine: "[Justin] told me a while ago. I kept my mouth shut, but now I can talk about it."
Eek! We guess we'll have to wait and see...
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