Proud mum Victoria Tweeted the snap of her gorgeous little girl toddling down the catwalk at the New York Public Library with the caption: 'Testing the runway!'
Harper later went on to enjoy her mum's forthcoming designs in the arms of her dapper dad David in the best seats in the house at New York Fashion Week.
Victoria was obviously very pleased with how the event panned out and was photographed breaking into a rare smile when the last of her models left the runway - she also tweeted that she was 'relieved' but 'couldn't believe it was all over'.
Aw! We're getting a bit obsessed with little Harper! HOW cute is she?
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