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Lady Gaga, Taylor Kinney

Dimitrios Kambouris/Getty Images

Mother Monster is getting married!

Lady Gaga is engaged to longtime boyfriend and Chicago Fire actor Taylor Kinney. She announced the news on Monday, two days after Valentine's Day, with an Instagram post that included a photo of a heart-shaped diamond engagement ring.

"He gave me his heart on Valentine's Day, and I said YES!" she said.

A photo posted by @ladygaga on

The 28-year-old pop star, who also debuted a new look on Valentine's Day, and her 33-year-old beau met on the set of her 2011 music video "Yoü And I" and later started dating. They have kept their relationship mostly private, making few public appearances together.

"When you meet someone that's not intimidated by the amazing people that are around you [or] by the love that you receive—that's love," Lady Gaga, whose real name is Stefani Joanne Angelina Germanotta, told Fashion magazine in 2013. "Men weren't always happy for me. It was very challenging to watch a woman be so successful."

Also that year, the singer talked about her relationship with Kinney on The Ellen DeGeneres Show.

"Well, he's a hidden weirdo," she said. "He is extremely strange, actually, and we complement each other's weirdness,"

she said YES on Valentine's Day ??

A photo posted by Taylor Kinney (@taylorkinney11) on

Gaga told U.K. paper The Times last fall, "He's the first man that I have dated that, when I sing onstage, he cries."

"That means more to me than anything," she added.