Justin Bieber has dismissed reports he's reunited with his ex-girlfriend, assuring fans he is still "single".

The teen pop star was rumored to have rekindled his romance with his childhood sweetheart Caitlin Beadles after she flew out to visit the Baby hit-maker in the Bahamas last month.

The news disappointed Bieber's dedicated female fans, but the star has now taken to his Twitter.com page to insist he's not in a relationship.

He writes, "I'm single and ready to mingle!! Haha!"

Click Here For More Justin Bieber Pictures