Selena Gomez apparently "had enough" of Justin Bieber choosing work over her.
The young couple are rumoured to have called time on their relationship, although neither has confirmed the split.
Both stars have heavy workloads and Selena was reportedly getting frustrated with Justin's failure to juggle his career and their romance.
"He's been continually choosing work over Selena and she's finally had enough," a source told RadarOnline.
The 18-year-old heartthrob has apparently been favouring work for some time.
Earlier this year Justin shot an episode of Punk'd with Miley Cyrus, which Selena apparently wasn't happy about.
"Justin did the show anyways, which didn't sit very well with Selena," the source explained.
Selena seems to be coping well with the alleged split, even stepping out for a high-profile red carpet appearance yesterday.
The pretty pop star won the Independent Spirit Award at the Glamour Magazine Women of the Year Awards and addressed young girls during her acceptance speech.
"Thank you so much. I am so honoured to be in a room full of women that I can only aspire to be as good as they are one day," she said at the event.
"I just want to share to all the girls out there that you have a voice, you have a chance to do what you love, whether that is acting or singing. And just being true to who you are."
© Cover Media