The former Spice Girl is releasing her own collection of bikinis for British high street chain Next but didn't feel the need to call her friend - who has her own ranges of denim, dresses and sunglasses - for help.
Geri also insist she doesn't share her ex-bandmate's passion for designer wear.
The 38-year-old star told Easy Living magazine: "I actually didn't ask her advice on this one. Victoria's doing very high-end, high fashion, and what she's done is brilliant. But she's always been like that. I remember when I was in the studio writing the lyrics for 'Who Do You Think You Are', and Victoria had been out shopping, and had gone missing for hours; she came in and she showed me these Manolo Blahnik shoes - and I didn't know they were designer.
"I didn't really know what designer was".
She said: "The stylist told me not to wear it - I'm really glad I ignored her."
For the full interview, see the March issue of Easy Living, out on Thursday (03.02.11).