Just days after posting a photo of his bare butt on Instagram, Justin Bieber has returned to the social-networking site to show off his new tattoo.

The 'Boyfriend' hitmaker has had the letter 'G' inked on his arm, and before you all jump to conclusions, it most definitely isn't a nod to ex-girlfriend Selena Gomez's surname.

JB has instead had the letter etched on his skin forpastor pal Chad and JuliaVeach's daughter Georgia, who suffers from a rare brain condition.

Writing alongside the image,the Biebs noted: "This is for the strongest couple i know Chad and Julia Veach! Their daughter was born with Lissencephaly. She is incredible and has the sweetest soul. You guys make me better and I'm blessed to have you in my life #Georgia #gtat."

Justin isn't the first person to get a 'G' tattoo in Georgia's honour, with rumoured girlfriend Hailey Baldwin also recently getting the letter inked behind her ear.

Speaking of how the idea came about,Veach previously explainedto the Christian Post: "A friend from New York came up with the idea… He designed it for Georgia and said every time we look at it, we'll pray for her and then it just kind of took off.

"Last week, I got two texts from people who got 'G tats,' bless their hearts. I don't know what the count is at but it's a lot of people. It's a pretty humbling thing when someone marks their body for your daughter."

He added: "We've seen people from actress Ashley Benson to Kevin Durant, MVP of the NBA get 'G tats.' It's an unbelievable act of kindness."

Nice work Justin!