Usher's girlfriend Grace Miguel has sparked engagement rumours after being spotted wearing a new engagement band on her ring finger over the Christmas break.

According to the singer's girlfriend-turned-manager was seen wearing an engagement ring while in Miami, Florida with the star over Christmas.

The pair have been dating since 2009 and Usher recently told Billboard magazine, "I have an incredible partner and manager. She has helped me through some of the hardest times in my life and my career.

"She's someone who's been able to support and understand all of who I am. Not just as a dancer or as a performer or as a singer, but as a humanitarian and a business man and as a person."

Usher was previously married to his stylist Tameka Foster and they have two sons together, 7-year-old Cinco and six-year-old Naviyd.