Justin Bieber is a well-known fan of getting inked, and every time he shows up somewhere with a new tattoo, his fans want photos as well as an explanation as to the meaning.

The 18-year old has a new piece, but so far the meaning isn’t forthcoming. The elegant black “x” on his forearm–just below the owl that was already there–could mean any number of things. As of now, this is his fourth tattoo of 2013, joining a rose on his leg, a Native American portrait on his shoulder, and his mother’s birthday on his collarbone.

For now, there aren’t any indications on his Twitter page as to the meaning behind the ink, but he does have a birthday coming up this week and is getting quite a bit of love from his fans in anticipation of the event.

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Image: Splash News

Imagine getting #RightHere to number one. That’d give justin two reasons to have a massive party on his birthday!!

— READ BIO PLEASE ? (@JustinsAvenger) February 25, 2013

we need to get #RightHere to number one to give Justin an early birthday present! YOU READY? 😉

— #JBMeetBeautifulJDB (@BeautifulJDB) February 25, 2013

@justinbieber your birthday is Friday. 19 years! Promise me you’ll never change. #ALWAYSKIDRAUHL! I LOVE U SO MUCHHHHHHHH! x1

— francisca. (@kissmejustinnn) February 26, 2013

It’s almost my baby’s birthday. I love you so much @justinbieber

— ? Jayne & Danah ? (@MustachioBieber) February 26, 2013