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Real Housewives of Orange County's Vicki Gunvalson probably isn't shouting out her trademark "Woohoo!" very much right now.

Earlier this week, she filed for divorce from husband Donn after 16 years together. "We tried," Vicki, 48, told "It's just too hard on both of us."

Her castmate Gretchen Rossi gave Us an update at a Bartel's Harley Davidson event in Marina Del Rey, Calif. Thursday.

"I was truly sorry to hear the news," Rossi told Us. "She's been having a really tough couple of days."

Rossi sent her pal a text message support after the announcement. "I've talked to a few people in the inner circle and it's a bad situation for her right now."

The reality star isn't sure what happened between the couple, who renewed their vows in July 2009. "It kind of took us all by surprise, because from what I knew...things were going well, so I don't really know what happened. It's very sad."

Following the announcement, Vicki told Us the split was "amicable."

She and Donn don't have kids, but her two grown kids from her first married, Michael and Brianna, lived with them both. Vicki also addressed the split on her official Facebook page.

"Donn has been an important part of my life and he will continue to be," she wrote.