Kelly Clarkson is officially engaged to her boyfriend of a year, Brandon Blackstock, the singer announced on Twitter Dec. 15

"I'M ENGAGED!!!!!" the 30-year-old wrote. "I wanted y'all to know!! Happiest night of my life last night! I am so lucky and am with the greatest man ever."

Clarkson even shared a photo of her gorgeous ring -- a yellow canary diamond.

"Everyone has been asking about my engagement ring, so here it is :)" she wrote, posting a photo. "It's a yellow canary diamond with diamonds around."

Just last month, Clarkson stopped by "The Ellen DeGeneres Show" and revealed that although Blackstock hadn't proposed yet, she knew he was going to.