Hailey and Justin Bieber Post First Adorable Family Snaps for Halloween

Justin and Hailey Bieber celebrated Halloween in a very exciting way this year … sharing their first family picture with baby Jack Blues!

The couple went the Disney route … Hailey dressed as the popular cartoon character Kim Possible … with Justin dressed up as Ron Stoppable and son Jack as Rufus. In the popular cartoon, Kim is a world-saving teen and Ron is her BFF sidekick. Rufus is Ron’s pet mole-rat — adorbs!

With his tiny face hidden … Justin cradled 2-month-old Jack … while mom gave a sweet, loving look at their bundle of joy. And yes, the couple made sure to get some snaps in of just the 2 of them — including one pic where JB flashed his abs!

The stars announced the birth of their son on August 23 – one day after he was born – posting a snap of their baby boy’s foot along with his name.

Jack was delivered by Dr. Thais Aliabadi … according to the birth certificate, obtained by TMZ — the same doctor who delivered babies for Khloe Kardashian and Kylie Jenner.