Selena Gomez is allegedly considering a boob job.

The former Disney star has recently reunited with on-off boyfriend Justin Bieber. And after rekindling their romance, the 21-year-old is reportedly considering drastic measures to keep her beau.

“Selena is putting a huge amount of pressure on herself to be sexy because she’s afraid of losing Justin,” an insider revealed to HollywoodLife.com. “She’s been asking people if they think she should get her boobs done because all the girls he was with have bigger boobs than her.”

Selena first dated the 20-year-old Baby singer in December 2010. However they split up in November 2012 and their relationship has gone from one extreme to the other ever since. In between their hook ups, Justin has been photographed with a number of beautiful women, which has reportedly now made Selena feel very insecure.

“She feels like she needs to be the hottest girl in the world to keep his attention. She’s studied every girl that he hooked up with while they were broken up, at least the ones she knows about, and compared herself to them down to every last detail,” the source continued. “For God knows what reason, Selena has really low self-esteem, she has a long list of things she thinks she could improve as far as her appearance. Even though she’s so beautiful she sees all kinds of flaws when she looks in the mirror.”

It's hoped Justin will be able to reassure the Come & Get It singer that she is the woman for him. It certainly seems like he is as besotted with her as ever, as it was recently reported that he had splashed out on a $10,000 Segway to prove they can have “good, clean fun together”.

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