Justin Bieber, Selena Gomez 'have broken up several times'
The teenage couple, who have been dating for around 18 months, most recently split last week before making up, according to TMZ.
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A source close to the pair alleged that their relationship is currently not "solid".
"They might be young, but Justin and Selena's is a very adult relationship," a second insider claimed to The Mirror. "They have had to grow up really fast because of the pressures of their careers.
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"To begin with, their similar situations complemented each other, but now they seem to be drifting apart."
Neither Gomez or Bieber nor their representatives have responded to the break-up rumours.
Bieber recently revealed that he has yet to have his heart broken by a girlfriend.
Watch Selena Gomez & the Scene in the video for 'Hit the Lights' below: