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Is Usher engaged?! Us Weekly reports that the singer popped the question to his longtime girlfriend Grace Miguel ... and it appears she said yes!

A source tells the magazine, "She's happy but they're trying to keep it quiet."

The couple has yet to actually publicly confirm their engagement, but were spotted together at the Golden Globes Art of Elysium Heaven Gala in Los Angeles this week ... and Grace was wearing some SERIOUS bling on that finger.

Photo: Getty Images

But if the news is true, have they been hiding it for a while? Here they are again in mid-December ... and Grace appears to be rocking that ring! 

Photo: Pacific Coast News

The longtime couple began dating in 2009 after Usher and his ex-wife Tameka split up. Usher opened up to Billboard about Grace in the fall saying, "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."