Demi Lovato supposedly "spearheaded" Selena Gomez's reunion with Justin Bieber.

Justin posted a picture of Selena hugging his neck on Instagram last week, just one day after a photograph surfaced which appeared to show the former lovebirds riding Segways together near his California home.

It's now claimed Demi, 21, initiated Selena's rekindled relationship with Justin.

"This was spearheaded not only over [Selena's alleged] lupus situation but the more she has been talking to Demi Lovato who is on her own break really made Selena take a look at her life and realise what is important and that is to enjoy some normalness while she is young," a source told about Selena, who split from 19-year-old Justin in December 2012.

Reports surfaced the brunette singer is suffering from autoimmune disease lupus and it's thought her ex-boyfriend could be helping her through a tough time.

Selena, 21, recently cancelled dates on her Stars Dance Tour, claiming she needed to spend some time on herself.
"There is zero time table to return to concerts or movies," the insider detailed.

"She is enjoying her time away from work and spending it with her family and Justin."

The pop star pair had been dating on and off since 2010, but went their separate ways after it was claimed Justin flirted with models at the 2012 Victoria's Secret Fashion Show.