The Celebrity Big Brother runner-up split from her second husband last year, after he allegedly accused her of cheating. She later claimed that she was mentally abused during their three-year marriage.
"Our marriage is officially over, thank God," she told Now. "It feels amazing."
Katona married Croft in 2007, and the pair have two children together - Heidi, 4, and Max, 3. They reached a custody agreement for their children back in April.
"He makes me feel sick," she added. "I hate him with a passion - he's a pr*ck. I really hate him. He's just an ugly wretch. I don't know what I ever saw in him."
The reality star is reportedly dating a man that she met on Match.com.
> Kerry Katona: 'I should judge Britain's Got Talent'