Victoria and David Beckham have been soaking up the sun in Miami to enjoy the last of the summer before their youngest daughter Harper heads back to school in September.SEE: Victoria and David Beckham's £19million Miami home has its own helipad - insideTaking to Instagram on Sunday, former Spice Girls star Victoria shared the sweetest video of her youngest sliding down a giant waterslide with David – and the father-daughter duo looked so alike as they beamed at the camera.WATCH: David Beckham