Two days prior to Blake Shelton and Miranda Lambert announcing their split, Lambert held a concert at the Cheyenne Frontier Days Festival. Nobody knew it was coming, but the four-year couple's split appears to have been long-planned by the couple, and Miranda went on with the concert despite the trying time.

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On Saturday, Miranda Lambert broke down at a concert during a Wyoming music gathering, where the 31-year-old country crooner performed her Grammy winning hits.

It was during the performance of the song "The House That Built Me" that Miranda Lambert broke down, even having to stop mid-song to fight her tears.

"The last thing someone wants to do is cry in front of 19,000 people," she told her adoring fans. She instead asked the crowd to sing with her and help her finish the song.

During the concert, noticeably missing was her wedding band. Therefore, the public have speculated right then and there that the reason Miranda Lambert broke down at the concert is because of marital problems. Another factor that probably caused her breakdown was the song "The House That Built Me," the career-breaking hit Shelton let her sing instead of him. The ballad, which one of her two CMA Song of the Year winners, became Lambert's big break in her country music career, according to Taste of Country.

In the fan-captured videos, Miranda could be seen wiping tears away with one hand while she kept the other hidden inside the pocket of her distressed jeans.

"I bet you know the song, so y'all sing it for me," she told fans. "It starts with 'Mama cut out pictures,' can you do that for me?"

The previous night, Blake performed at the same Wyoming venue, but at the time, the couple have not released any announcement regarding their divorce yet. Blake, 39, was last seen at the NASCAR Sprint Cup series auto race opening ceremonies in the New Hampshire Motor Speedway Sunday.

It was all about tonight! Who enjoyed @blakeshelton tonight? #CheyenneFrontierDays #frontiernights #cfdrodeo pic.twitter.com/NILEosLso9

— CheyenneFrontierDays (@CheFrontierDays) July 18, 2015

According to TMZ, Miranda Lambert and Blake Shelton's divorce papers were officially signed by a judge Monday. Apparently, two weeks earlier, Blake had secretly filed for divorce. The couple has a prenup, stating that Lambert will be keeping their Nashville marital home while Blake will get their Oklahoma ranch.

The joint statement they released Monday said:

"This is not the future we envisioned and it is with heavy heart that we move forward separately. We are real people, with real lives, with real family, friends and colleagues. Therefore, we kindly ask for privacy and compassion concerning this very personal matter."

Miranda Lambert and Blake Shelton got married in Texas May 2011. There was no reason given for the split, but since the two hitmakers did not have any children, many have speculated before that this could be the reason for the divorce.

The couple's marital issues have long been rumored, according to The Daily Mail.

In an April 2014 issue of Life & Style magazine, the fights the couple have had over the years were detailed.

According to the outlet, Lambert was desperate to have a baby, and Shelton's partying did not help their marriage.

"Friends think it's the end for Blake and Miranda. Miranda gave him an ultimatum to shape up or ship out. She told him she wanted to start trying for a baby soon, but that he had to clean up his act first," according to a source at the time.

His partying reportedly created "an obstacle they can't overcome."

"She's done with him humiliating her and is ready for him to grow up and get serious about their family's future. I have no doubt that she's leaving Blake if he doesn't change," said another source.

The couple later turned the issue into a joke. Blake had been divorced before to long-time girlfriend Kaynette Gern. The couple divorced in 2006, reported People.

Watch the concert video here.

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