The 'Yeshua' inking was done in May and his dad, Jeremy Bieber, wasn't just there to give him support. He got a matching tattoo on his ribcage too.
The tattoos were reportedly done back in May, just before Justin jetted off to Hawaii for a holiday with girlfriend Selena Gomez.
Now Jeremy has posted a picture from his day at the tattoo parlour with Justin on his Facebook page.
Other pictures have appeared around the web showing Justin gripping his dad's hand for some extra courage.
Although Justin was underage for both tattoos, they could be done because he had received parental permission.
He has always been very open about his Christian faith and the latest inking is another indication of how seriously he takes it.
He recently visited the Holy Land and its religious sites, and described his time there as "truly special".