The former glamour model thinks her ex-husband - with who she has children Junior, nine, and seven-year-old Princess - looks a lot better now than when they tied the knot in September 2005.
Admitting the singer had hair extensions when they tied the knot, she added: ''He was fatter. On our wedding day, he looked like a proper fat freak. A sweaty freak.''
Pregnant Katie - who also has sons Harvey, 12, from a previous relationship and 10-month-old Jett with estranged husband Kieran Hayler - admitted she is unsure what she finds attractive in guys these days.
Asked if she thinks David Beckham is good looking, she said on her Fubar radio show: ''He did look smart [at Wimbledon] ... He's not ugly, is he? ... I don't know what my type is anymore.''
The 36-year-old beauty was supposedly involved in a feud with David's fashion designer wife Victoria many years ago, and though she insists she doesn't have a ''problem'' with the former Spice Girls star anymore, she still lashed out by crediting ''good management'' for a lot of her success.
She said: ''She has worked hard - but lots of us work hard. I just think by being with David, she was in a girl band, that's obviously what triggered it off ... They played it well; had good management and I think that worked well.
''You know, he's [allegedly] cheated on her, she's stuck by him.
''They've had their ups and downs but they're then known as this perfect couple. Nobody's perfect. They've had dramas in their own lives as well.''
The actress thinks it would be tough to recast her character, Winifred Sanderson.
Beck wishes he'd had ''more fun'' when Kanye West invaded the stage in protest at his 2015 Grammy Awards win.
The Duffer Brothers wanted to "experiment a little bit".