Valentine's Day was a banner day for Lady Gaga.

The singer got engaged to her longtime boyfriend, Chicago Fire star Taylor Kinney, according to a post on Instagram.

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"He gave me his heart on Valentine's Day, and I said YES!" Lady Gaga wrote, alongside a picture of her hand with a heart-shaped diamond ring on her finger.

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

A photo posted by @ladygaga on

Kinney, 33, and Lady Gaga, 28, have been an item for about four years.