Bieber Break-Up? Star 'Splits From' Selena

Justin Bieber and Selena Gomez are believed to have ended their relationship, blaming their hectic schedules for the split, according to reports.

The 18-year-old pop star, who is currently on the road as part of his Believe tour, has been dating the Disney actress for two years.

The couple broke up a week ago, a source has told E! News, claiming: "Because of their crazy schedules, it was getting harder and harder to maintain a relationship."

Neither Bieber nor Gomez, 20, has commented on the reports.

Rumours began circulating after Bieber was spotted attending a performance of The Lion King on Broadway with a group of people, including Victoria's Secret model Barbara Palvin.

A photograph of the two together was posted on Twitter, though the model later tweeted: "Hey everyone. Please calm down. He is all yours!! :) Please :)."

Bieber and Gomez used an Oscars party to go public with their relationship in February 2011.

Since then, Gomez has been the subject of constant internet attacks from Bieber fans, which she previously revealed "hurt" her feelings.