R'n'B star Ne-Yo has been branded disrespectful and insensitive after announcing his break-up with fiancé Monyetta Shaw on Instagram.

Fans lambasted the Let Me Love You singer on the social network site after he revealed that he ended his four-year relationship with Shaw - the mother of his two children.

Posting a picture of the couple he wrote: "Tho fate has decided to split our romantic paths, know that I will always love you. Forever your partner. Forever your frien. Forever my miracle."

"I'll always be there. Always.@incognemo Forever my miracle," he added.

Adding salt to the wound Ne-Yo appeared with a new lady love on the red carpet at the 2013 BET Awards after notifying his former fiancée that he was moving on.

"There's no loyalty or respect for what is between your two energies," one unimpressed supporter told him.

Another said: "Where is your respect and dignity at for your kids and child's mother? Very unprofessionally done y'all could have sat over dinner before hitting up instagram."

According to celebrity site Media take Out, Shaw, an actress and children's author, was just as surprised as his fans.

"She and Ne-Yo were having issues," a friend said. "Nobody knew he was going to put her out there like that. It was very tacky."