Jools Oliver has paid the sweetest tribute to her youngest child, River, in honour of his fourth birthday on Friday. Sharing a series of heartwarming photos of her little boy, the doting mum - who is married to celebrity chef Jamie Oliver - urged her son to continue to be "happy" and "free" as he always is.GALLERY: 10 of Jamie and Jools Oliver's cutest family photos"River you beautiful, creative, hilarious, cuddly little human, now you are four," she wrote in the caption.
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