Miranda Lambert isn't afraid to fight -- at least when it comes to a song.

Lambert says she when she first heard her recent chart-topping song 'Mama's Broken Heart' -- which Kacey Musgraves wrote intending it for her own debut album -- she was willing to do whatever it took to make sure the song ended up on one of her records instead.

“I loved the song so much I was willing to fight for it if she didn’t want it,” Lambert explained during her recent No. 1 party for the single (quote via Country Weekly). In fact, she was so enamored by the tune, she took time out of her own 2011 wedding celebration with husband Blake Shelton to discuss the song with the writer.

“[Musgraves’] sister was taking pictures of us and video and I pulled [Musgraves] aside and said, ‘We need to talk about ‘Mama’s Broken Heart,’ and she’s like, ‘Here, right now?’” Lambert tells Nashville's Tennessean newspaper. “I was like, ‘Yes, it’s that important. The wedding can wait.’”

Letting someone else record her song wasn't an easy decision for Musgraves, even if that someone was already a multi-platinum selling artist. “I asked her if I could have it and told her to think about it and let me know,” Lambert says. “A week later, she wrote me an email and said, ‘Well, if I can sing harmony on it I guess you can have it.’ I said, ‘Deal.’"

It looks like Musgraves made the right decision, since it doubles her chances of walking home with a CMA trophy in November. The tune is nominated for a CMA Award for Song of the Year, along with Musgraves' debut single, 'Merry Go 'Round,' which she co-wrote with Josh Osbourne and Shane McAnally.