Businesswoman Katie, 36, recently gave birth to her fifth child and she was said to be 'furious' that, eight weeks later, she still couldn't get into her dress at Kerry's wedding t George Kay.
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Instead of joining Natasha Hamilton and Liz McClarnon in Kerry's bridal party, Katie is said to have shown up at the wedding in a strop and wearing a plain jumpsuit.
A source told The Sun: "Katie was not even prepared to consider wearing a dress that didn't fit her properly.
"As soon as she found out, she pulled out of her official role altogether. Kerry was disappointed, but wasn't going to let it ruin her day."
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Other bridesmaids included Mel B's sister Danielle and one of Kerry's school friends.
But Kerry didn't let Katie's reported tantrum ruin her and George's day.
The source continued: "Katie made it clear she was unhappy at having to wear the playsuit. She had a face on her like a bulldog chewing a wasp.
"She sat through the ceremony in silence and left straight after the meal. But there were no major dramas. Kerry and George were in bed by 11pm and weren't even drunk."
Kerry and Katie recently rekindled their friendship, after the fell out over Kerry's former relationship with Mark Croft.
The pair originally met when they both took part in I'm a Celebrity… Get Me Out Of Here in 2004.