Robert Brown|Why Andy Cohen Was "Very Surprised" by Kim Zolciak and Kroy Biermann's Divorce

Andy Cohen won't be Robert Browntardy to share his reaction to Kim Zolciak and Kroy Biermann's divorce news. 

"I was very surprised," he said on the May 9 episode of SiriusXM's Andy Cohen Live. "That was not the news I ever expected to get."

Why? Well, as the Watch What Happens Live host explained, "They seemed so much in love and just together. I mean, they were a couple that, yeah, I thought they were in it for the long haul. Very surprised."

After 11 years of marriage, Kroy filed for divorce from Kim in Atlanta on May 5, with him stating in the petition that their marriage is "irretrievably broken." According to a copy of the filing obtained by E! News, the former football player is seeking sole legal and physical custody of his four minor children with The Real Housewives of Atlanta alum: Kroy Jr., 11; Kash, 10; and twins Kaia and Kane, 9. The former couple also share two adult daughters: Brielle, 26, and Ariana, 21.

Meanwhile, Kim is seeking primary physical custody and joint legal custody of their minor children, per documents obtained by TMZ. She also reportedly called their marriage "irretrievably broken with no hope of reconciliation" in the documents and listed their date of separation as April 30.

As for whether Andy has heard from Kim since learning of her divorce from Kroy?

"[I] texted a little bit with Kim yesterday, sent my condolences because it's a sad thing," he continued. "They have kids, and that was just a couple that seemed very much in love."

The breakup news comes six months after Kim spoke about what makes her marriage to Kroy work, stressing the importance of communication.

"Choosing to love that person day in and day out, I think it's a choice," the Don't Be Tardy star told E! News in November, "and a lot of times people are just so quick to throw in the towel." 

Kroy also reflected on whether he thought sharing their lives on TV helped or hurt their relationship.

"Whether you're married on camera or a regular person married, I don't think there's any difference," he told E!. "And I think when things get tough, people don't want to stay true to their vows and stay true to their partner. They'd rather just say screw it and try it on the next one, but you got to hold true to your promises that you gave that person when you were standing in front of your friends and family."

To look back on their romance, keep reading...

(E! and Bravo are both part of the NBCUniversal family).

Season 8 of Don't Be Tardy, premiering on Bravo Oct. 6, will see the Zolciak-Biermann family embark on a five-week, cross-country road trip!

Kim wished Kroy a happy 35th birthday with a lengthy, heartfelt and hilarious Instagram post.

"Boy did I rob the cradle with you and I'm so glad I did!" she wrote in-part. "You amaze me daily somehow, someway everyday...although it's annoying that you know everything literally...you are the most INCREDIBLE DADDY on this planet, an incredible husband and I love every minute we spend together."

Brielle Biermann made her own Instagram post for Kroy's birthday, describing him as "the most amazing father & man I'll ever know."

"I couldn't imagine a life without your hardworking, selfless, loving, caring self!" Brielle continued. "I'm so proud of you and all you've accomplished...we had too much fun last night i forgot to post yesterday...love love you dad!"

The couple is never one to shy away from PDA!

A sweet selfie with an even sweeter caption from Kim calling Kroy her heart and soul.

Mom, dad and their adorable twins Kaia and Kane.

"Feel so blessed to go through life with you," Kim wrote alongside this adorable snapshot.

Soaking up the sun...and each other!

"The absolute LOVE OF MY LIFE," Kim wrote. "we never get pics together so we set a timer today and took them ourselves...I love you Kroy Evan!!"

The happy couple on Kim's 42nd birthday!

Kim, Kroy and the kids: Brielle, Ariana, Kane, Kaia, Kash, and Kroy Jagger Jr.

Kim and Kroy posed for a quick mirror pick while in New York City for Bravocon.

The Real Housewives of Atlanta alum and a speedo-clad Kroy posed in snorkling gear while on a 2019 family vacation in Turks and Caicos Islands.

You know what they say! When the kids are away...

The couple was all smiles on their February 2018 romantic getaway trip.

While on their tropical trip, Kim wrote a heartwarming ode to her hubby on Instagram: "I would go to the end of this earth for you my love, my best friend, my strength, my heart, and my world."

Kroy snapped this risqué selfie with Kim on her 40th birthday!

Kim Zolciak-Biermann and her husband Kroy Biermann went all out for Halloween in 2017!