United Kingdom, March 7 -- Lady Gaga and fiance Michael Polansky are planning to tie the knot "soon".

The 39-year-old star revealed the wedding is imminent and she and Michael 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 fiance have been traveling all year, but we're getting married soon. We were hoping that maybe you could choose a special song for us."

Bruno, 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 ded...