Victoria Beckham led the tributes to her daughter Harper on Saturday as she marked the youngster's tenth birthday.Taking to Instagram, the mum-of-four shared the most adorable throwback video of Harper performing a tap-dancing routine – and she looks so tiny!MORE: Harper Beckham dances with David and you've got to check out her new dressIn the clip, Harper tentatively walks from the family's living room into the corridor before taking a bow.