Justin Bieber seemed to dedicate one of his songs to Selena Gomez during his surprise appearance at SXSW Festival on Sunday (March 9).

Following rumours of a reunion after the pair were spotted at a dance studio together, JB appeared to fuel the speculation after taking to the stage to perform his hit As Long As You Love Me at the Scooter Braun Projects Sunday Funday Showcase in Austin, Texas.

The 20-year old heartthrob was joined at the event by his Believe tour support act Cody Simpson, with Selena also apparently in attendance after being spotted by the side of the stage.

After singing his smash hit single Boyfriend, Biebs reportedly dedicated As Long As You Love Me to his "baby" - with online reports suggesting her was referring to Gomez.

Following his impromptu performance, the teen idol took to Twitter to write: “Fun taking the stage with all the other acts. Great people. Had to do a little acoustic set myself. Maybe I should do another one? ;)."

Bieber also hit the headlines this week to defend his actions after footage of his deposition in Miami was revealed online, with the star tweeting: "Love how some people love to twist and justify the horrible action of others. We all have a right to defend ourselves and feel harassed."