Robin Thicke showed off his muscular physique while cruising around a luxurious yacht aroundCabo San Lucas, Mexico with some friends on Tuesday afternoon.As he walked barefoot around the ship, the45-year-old Blurred Lines singer displayed hisripped chest and bulging biceps in apair of black swim shorts and aviator sunglasses over his light blue eyes.The five-time Grammy nominee was thepicture of relaxation as he spent some quality time with his spouse, 27, whosported a patterned grey one-piece with sexy crisscrosses on the back. Cruising around: Robin Thicke showed off his muscular physique while cruising around a luxurious yacht around Cabo San Lucas on Tuesday afternoonThe mother-of-three looked blissful as she let herbrunette tresses cascaded freely in soft curls down her back while keeping her black shades perched on top of her head.