Article continues below advertisementBritney Spears is eager to get her body in shape.The pop star, 44, revealed in a Sunday, December 28, Instagram post that she wants to "lose weight" as she heads into 2026.Spears flaunted her slim physique in a fiery red bikini top and white thong as she reflected on her figure.Article continues below advertisementSource: @britneyspears/InstagramBritney Spears wants to lose weight."I know I'm not perfect ... I need to lose weight and my hair needs to be colored.