The 39-year-old star revealed the wedding is imminent and she and Michael Polansky are searching for the perfect wedding song.
Gaga revealed the news when she called into Bruno Mars' iHeart Radio livestream Romantic Radio with a request for the host.
She said: "Hi, Bruno. Me and my fiancé have been travelling all year, but we're getting married soon. We were hoping that maybe you could choose a special song for us."
Mars, 40, replied: "I know that voice. That is my dear friend Lady Gaga.
"If you're looking for a song to dedicate to your husband, I would say, off this new album of mine, I would go with Risk It All', track one. So I want to dedicate this one to Lady Gaga and her fiancé. Michael, this is for you too."
He then played the opening song from his new album The Romantic.
Gaga and tech entrepreneur, investor and philanthropist Polansky were first linked in 2020 and revealed their engagement in 2024.
The pair went on to collaborate on her 2025 album MAYHEM, where Polansky served as a co-producer and co-wrote several songs.
Speaking about how he inspired her son Blade of Grass, Gaga told Zane Lowe on Apple Music: "As a songwriter you need life to inspire your writing and if everything is promotion, then I'll write about promotion and I won't write about that special moment I shared with you where Michael asked me how I would want him to propose to me one day.
"We were in our backyard and I said, 'Just take a blade of grass and wrap it around my finger'. And then I wrote 'Blade of Grass' because I remembered the way his face looked and I remembered the grass in the backyard and I remember thinking he should use that really long grass that's in the middle of the backyard."
Gaga has credited Polansky with transforming her life.
The pop star described herself as a "healthy, whole person" after finding love.
She told Rolling Stone: "Being in love with someone that cares about the real me made a very big difference."
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