Victoria Beckham is known for dressing up in her designer dresses and high heels, but we're quickly becoming just as obsessed with her off-duty style.The star visited the Superblue art experience in Miami on Thursday with husband David and children Harper and Romeo - rocking her leggings, long-sleeved top and favourite cap for the day out.MORE: Victoria Beckham's latest hair transformationPosing for a selfie in the mirror at one of the exhibits, created by artist Es Devlin, Victoria looked