"I was totally blindsided," Stewart said on TV's "Watch What Happens Live" Sunday. "But when I found out about the divorce, it was absolutely a surprise."
Porsha Stewart recalled waking up from a nap to see she had missed calls from her sister.
"She said, 'Have you heard?' And I'm like, 'Heard what?' So I went to Twitter and the first thing I see is, 'Kordell divorcing Porsha,'" she said. "And I'm like, 'This is just a crazy joke...' I found out from Twitter."
Kordell Stewart filed for divorce March 22 after less than two years of marriage, UsMagazine.com said.