By Lucy Robinson & Lucy Robinson & Susan Knox Joe Wicks has excitedly taken to social media to share his wife’s growing baby bump during a sun-soaked holiday – sparking a guessing game among fans about whether the new addition will be a boy or girl. The fitness guru, 38, otherwise known as The Body Coach, is already a proud dad to two daughters, Indigo and Leni, and son Marley with his wife Rosie. Joe delighted his Instagram followers with a series of heartwarming snaps from their family getaway as he and his wife prepare to welcomed their fourth child. In one wholesome photo, Rosie is absolut…