Article continues below advertisementBritney Spears flaunted her slim physique in a rare photo with best friend and manager Cade Hudson.The pop star, 44, stunned in an off-the-shoulder, black-and-white polka dot frock in a snapshot shared to her Instagram on Monday, December 29.Spears captured an image in the mirror while Hudson placed his hand on her red phone case, seemingly to help her position the camera.Article continues below advertisementSource: @britneyspears/InstagramBritney Spears hung out with longtime friend Cade Hudson.