The singer said she forces herself to concentrate when she walks past photographers.
She said: 'I don't want to fall over. I just want to get to my car, because if I fall over, someone is going to shove a camera lens up my skirt and get a picture of my knickers, which is kind of not cool.'
She added: '[But I'm not] one of those people who goes out without any knickers on.
'I'm the complete opposite – I'll wear shorts under my skirt!'
Mum-of-three Victoria, 36, who is expecting her fourth child with husband David Beckham also told how she is finally comfortable in her own skin.
She told Allure magazine: 'For the first time, I feel like what you see is what you get.
'This is me: the more natural hair, the slightly more relaxed way of dressing. I feel really content personally and professionally. I'm not freaked out about getting older.
'I'm growing older with the most amazing man I've ever met - with my soul mate. Life's great.'