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You weren't the only one who was completely blind sighted by Yolanda Hadid's divorce.

Her Real Housewives of Beverly Hills co-star Kyle Richards reacted to the shocking news tonight while on Andy Cohen's Watch What Happens Live. When asked about her thoughts on Yolanda's split from hubby of four years, David Foster, Kyle said it's "very sad," and admitted that there may have been some hints of trouble in paradise.

"In some ways, yes," she said. "I mean, we didn't know. I think that they've been struggling and Yolanda's been so sick. I don't know if that has anything to do with it. It's so sad."

She added that David was present at Kris Jenner's birthday party, but Yolanda was in New York City supporting Gigi Hadid's Victoria's Secret Fashion Show debut. And although David was around, he didn't mention anything about what was going on at home.

"I do feel really bad," Kyle adds. "She's struggling right now. To have to go through that at the same time as Lyme disease, it's gonna be hard."

Other co-stars took to Twitter to express their support for the star:

Yolanda Foster, David Foster

Dimitrios Kambouris/Getty Images for EJAF

The former model and the songwriter-record producer have been together for nine years, and weren't shy about flaunting their admiration and love together on the Bravo show.

"Sadly we have decided to go our separate ways. We've shared nine beautiful and joyous years together and during that time we experienced love, friendship, and the inevitable challenges that come with managing a marriage, careers, blended families and health issues," the couple tell E! News in a joint statement.

"We are grateful for the years we've spent together and believe wholeheartedly that we did our best. I hope that we can pave the road ahead of us with all we've learned and with the love and respect we will always have for one another."

The details surrounding what caused the couple to split have not been revealed, and just like fans, a source tells E! News Foster's RHOBH co-stars are in shock. "Yolanda always seemed absolutely in love with him and was always talking about how proud she is of him."

Additionally, filming for the Bravo reality show has already wrapped, so their split will not be played out on the small screen.