Lady Gaga is engaged to marry her boyfriend of four years, actor Taylor Kinney, the singer confirms on Instagram. The Chicago Fire star proposed Saturday with a huge heart-shaped ring.

"He gave me his heart on Valentine's Day, and I said YES!" Gaga captioned a photo of the giant rock.

| CLICK HERE FOR STARS ROCKING THEIR ENGAGEMENT RINGS |

The couple later celebrated the news at Gaga’s family's restaurant, Joanne Trattoria, on the Upper West Side of Manhattan.

The two first met on the Nebraska set of Gaga's "You & I" music video in 2011. They started dating several months later, split briefly in May 2012, and got back together the following month.

The low-key pair, who rarely speak out about their relationship, were rumored to have held a commitment ceremony last October.

Congratulations to Gaga and her fiancé!

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(Photo: PBG/Empics Entertainment/PA Photos/Landov)