Isla Fisher didn't like fashion until she made 'Confessions of a Shopaholic'.

The 37-year-old actress claims she never used to worry about what she wore until she landed the lead role in the 2009 romantic comedy about a woman with a serious spending problem who blows all her income on clothes.

Discussing her lack of fashion acumen, she joked: ''You should see me on the school run. I was never really that into fashion until I filmed 'Confessions of a Shopaholic'.

''After working every day with stylist Patricia Field, from 'Sex and the City', I went from wearing what was clean in my laundry basket to high-fashion designers.''

The flame-haired star has since updated her wardrobe with an enviable selection of designers who cater for her petite frame, as well as an array of high street favourites like Topshop.

She added in an interview with Britain's HELLO! magazine: ''I love Zac Posen and I'm a big fan of Vivienne Westwood, Stella McCartney and Philip Lim. I'm only tiny, so many labels don't cater for me, but these designers don't swamp me.

''And high street, I like so many. Topshop and Mango are fantastic for quick buys.''