The couple's split was confirmed to U.S. celebrity magazine People by a representative for the singer.
A source added to the publication that there was "no long dramatic story", insisting that it just "didn't work out". "Relationships sometimes end. There's no long dramatic story". Though the couple attended the Screen Actors Guild Awards together in January, she was noticeably not wearing her engagement ring at the GRAMMY Awards earlier this month.
She also posted a photo of music notes tattooed on her forearm to the tune of her musical moniker, 'G A G A'.
However, the pair remained very private about their romance, keeping much of it behind closed doors.
After Gaga, 32, attended the Grammys solo and without her engagement ring on February 10, rumors flew that the engaged couple had called it quits.
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The news comes four months after the Oscar nominee confirmed their engagement. She had been rocking a pink diamond ring on that finger at the time and ET confirmed the news with her manager.
Gaga's split with Kinney came at another high-profile moment in the artist's career.
'Christian loves to make her happy and he is so proud of her success.
"This relationship is different because Christian understands her on a more intimate level. My fiancé, Christian. All the loved ones in my life who take care of me every day".
Metro.co.uk has contacted Lady Gaga's reps for a comment.