Kerry, 34, and George are getting married tomorrow and, although they've given away nothing themselves, Liz couldn't help but give us some hints.
READ: KERRY KATONA REVEALS 'MY FAMILY IS IN SO MUCH PAIN'
Speaking to Closer at The National Lottery Awards, Liz, 33, said: "I'm very excited, I'm on my best behaviour tonight because I've got to drive early in the morning because we've got a couple of surprises planned."
While she wouldn't tell us exactly what the surprises were, Liz did admit she was nervous about pulling them off.
She continued: "I'm in charge of a couple of things that I'm sh*tting myself about!"
READ: CHANTELLE HOUGHTON SLAMS KERRY KATONA
Liz revealed that Kerry is having four bridesmaids, including herself and their other band mate, heavily pregnant Natasha Hamilton.
Despite the fact that 32-year-old Natasha is due to give birth any day now, she is determined to make it to the wedding.
Liz said: "She just wants to be there for Kez, really. We're just really excited about it and looking forward to it."
While she and Natasha may have some surprises for Kerry up their sleeves, Liz insisted the most important things to her friend are her children and George.
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She said: "She wants it to be a really special, family orientated day – and if they're happy, we're all happy."
Kerry might have just given birth to her fifth child, but Liz confessed she has no plans to stop there.
Liz, who doesn't yet have children of her own, added: "She wants bloody loads. She's nuts. In Atomic Kitten it's all about extremes, either you have loads of kids or none; I'm like the other end."
The National Lottery Stars 2014 is on BBC One on Friday 19th September at 10.35pm