Kelly Clarkson's divorce filing from her husband of seven years, Brandon Blackstock, caught most of their friends completely off guard.
"It came out of nowhere," one insider told E! News. "It's all so sad for the kids. They were always such a loving family. It never seemed like they had any issues."
The source said the news is "quite shocking" and noted that friends of the duo "have been texting each other over their disbelief that the couple is splitting."
"Brandon was around all the time on almost all show days and they were very loving towards one another," a second insider told E! News. "They drove home from set together every night."
The divorce filing came a month after the couple listed their Los Angeles house for $10 million.
Prior to the filing, Kelly had been quarantining with Brandon and their children — River Rose, 5, and Remington Alexander, 4 — at their Montana ranch. She even filmed her talk show, "The Kelly Clarkson Show," from the ranch.
Interestingly, a source tells Entertainment Tonight that quarantining may have been the final straw for the couple.
"Kelly and Brandon had been having problems for several months and were making a conscious effort to work things out. They both hoped quarantining away from L.A. in Montana would help them work things out in their marriage, but instead the change in environment was actually detrimental," the source said. "The constant time together seemed to make an already challenging situation worse."
Kelly's busy schedule "definitely helped to keep her mind off things, but this recent downtime gave her the time she needed to think about her life and her marriage," the source said.
A second source close to "The Kelly Clarkson Show" told ET that many on staff were "in the dark" about her decision to file for divorce.