Katherine Heigl may have starred in 27 Dresses - but in the real world, it only takes one!

We caught the starlet out for a little Euro-flavored retail therapy with her mother and Gray's Anatomy buddy T.R. Knight while in Paris.

The Knocked Up knockout was on the hunt for all sorts of things - we caught her perusing antiques, cosmetics, and even violins.

But Katherine's eye seemed to be most taken by one particular gown - and we're inclined to agree!