Justin and Hailey Bieber's 6-month-old son, Jack, got in on his dad's birthday festivities! Two days after the signer turned 31, he posted more photos from his celebration, with one of them featuring the new father holding his adorable tot.

Justin Bieber is celebrating his first birthday as a father. The singer takes to social media to share a sweet new shot of his and wife Hailey Bieber's son Jack Blues Bieber in honor of his 31st birthday.

The two-time Grammy winner also celebrated his big day with several of his longtime pals during a daytime hangout

Justin Bieber and wife Hailey Bieber have sealed Justin's 31st birthday celebrations with a kiss. Justin, 31, shared an Instagram Story on Sunday, March 2, that captured Hailey, 28, presenting him with what appeared to be a homemade birthday cake decorated with candles.