Rumour hast it that young pop star Justin Bieber has one last chance to prove his love for his girlfriend Selena Gomez.

It is reported that the young couple has rekindled their love during their romantic getaway in Mexico last New Year's Eve. It seemed that the two also hammered the details of their renewed relationship.

The Hollywood cute couple is in an on and off relationship after they broke up several times because of various reasons.

"[Selena] said she wants to start things new with Justin again and act like they are a new couple and leave all of the drama and bulls**t behind," the source explains.

Initially, Selena's tweet was a little concerning, implying that 2013 may be Justin-free. Thankfully, our source assures us that Selena wants her relationship with Justin to be stronger than ever in 2013, and the tweet was just a way to hold Justin accountable.

The source adds, "She said 2013 is their year and they need to get back to basics. She wants to hold him to it though so she's letting all of her followers know."

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.