Tim McGraw and Faith Hill look poised to win their next Grammy together on Sunday.

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Based on some of the Grammy predictions this week, the country stars might just be the most profitable married couple in the business. They are considered the frontrunners to take home Best Country Duet or Group Performance for Meanwhile Back At Mama's, a duet off McGraw's Sundown Heaven Town album.

According to Taste of Country, the honesty of their performance and the depth of the song outdoes some of the nominations.

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While McGraw and Hill are known for frequent collaborations, they don't let their marriage decide when they release a duet. "We make the song motivate the singing together," claimed McGraw during an interview with Rolling Stone back in January. "Instead of singing together motivating the song."

So far, the system seems to be a success for them. Their hit duets over the last ten years include It's Your Love (1997), Just To Hear You Say That You Loved Me (1998), Let's Make Love (1999), Like We Never Loved At All (2005), and I Need You (2007).

Meanwhile Back At Mama's has the couple up for two awards at the Grammys this year, with nods for Best Country Song and Best Country Duet Or Group Performance.

Married for over 18 years, McGraw and Hill live in the country with their three daughters.

The 57th Annual Grammy Awards will air live on CBS from Los Angeles on Sunday, Feb. 8 at 8 p.m. ET.