Justin Bieber has teased a brand new song on Instagram - with many speculating it could be about rumoured girlfriend Selena Gomez.

Over the weekend, JB posted a 15-second clip of the song, Life Is Worth Living, on the website, with the ballad showing off Bieber's smooth vocals as he croons: "Life is worth living/ So live another day."

The pair were spotted earlier this month in Gomez's home state of Texas, where they grabbed dinner with friends, hit up a local Starbucks and had steamy dance rehearsal for ... something.

The song's positive vibe is a change for Justin, whose previous track, Broken, surfaced in February and saw the 20-year-old taking aim at the media and the haters.

But Bieber made time for more than just music: The pop star added some new ink to his collection as well. He posted (and later deleted) a photo of the tattoo on his right arm, which strongly resembles famed street artist Banksy's Balloon Girl.

The official Instagram account for the British artist later posted a photo of Bieber — who has made his love for graffiti art no secret — with the caption: "Controversial".