Recent photos of Selena Gomez showed that she has been losing weight because of her superstar boyfriend Justin Bieber.

Some reports claimed that Selena is shedding weight from her already tiny frame as an effort to make Justin stay. While others claimed that it was because of stress and depression that the actress is experiencing from her relationship issues.

According to sources, the Wizards of Waverly beauty is feeling increasingly anxious about her rocky relationship with Justin despite the pair recently reconciling.

"Her up-and-down relationship with Justin Bieber is taking a toll and she [looks] thinner than ever. She isn't eating because she has so much anxiety about Justin being faithful and doing right by her. Selena's freaking out," a source told Life & Style.

Reports suggest that Selena's biggest worry is Victoria's Secret model Barbara Palvin, who Justin is rumoured to have spent time with earlier this month while he performed at the Jingle Bell Ball in Atlanta amid rumours the pair were having an affair.

Barbara seemed to have no love for Selena as she publicly admitting her dislike for Selena during a web chat with fans.

"She's stressed about the fact that [Justin's] added more tour dates and they'll be apart for longer. She doesn't trust him. Justin is on tour again and isn't living up to his promises to Selena. Selena hates how braggy Barbara is about it all, wearing his shirts, tweeting from his locations, and following him all around," a source said.

On the other hand, The Hollywood cutest couple is reportedly have patched things up and made up. The two gave love a second chance as they were recently spotted with Taylor Swift and Harry Styles enjoying a romantic ski trip in Utah which ended with some cuddly kissing at the airport as Selena snuggled in Justin's lap.

Then, the two spent Christmas apart as Selena went to her home in Texas. While Justin tweeted a sexy photo of his girlfriend on Instagram with a status, "All alone on the jet, missing u already :(,"

See the slideshow for the photos of Selena Gomez and Justin Bieber.

Hollywood Justin Bieber