Justin Bieber posted to his 212million Instagram followers on Wednesday with his wife, Hailey Bieber, and his two sisters, Allie and Jazmyn Bieber.'My favorite girlsss,' the 27-year-old heartthrob captioned the black and white picture. Justin is rocking a buzzcut and is showing off his completely tattooed chest, while Hailey, 25, rested her head on his shoulder.The Canadian singer and his wife are on a pool lounge chair in bathing suits with his two half-sisters not far behind him.