Muscle Marilyn

Muscle Marilyn is a bodybuilder, fitness model, and porn star from the United States. Born on Friday, September 2, 1988, she is an American of Caucasian ethnicity. Standing 5'2" (or 157 cm) tall and weighing 161 lbs (or 73 kg), she has a muscular build with natural breasts, blonde hair, and brown eyes. She started her career in 2019 and has been active for about 7 years.

Offstage, she is known as Lauren Murphie Smith, an IFBB Pro competitive bodybuilder who competes in the Women's Physique category. Her exceptional muscular conditioning and significant lower-body development have been celebrated by judges and curators alike, with deep quad definition and highly conditioned glutes. She earned her IFBB Pro Card at the 2025 Vancouver Pro Qualifier, winning the overall title. Before that, she spent years rising through the ranks of the National Physique Committee (NPC) and regional circuits, including the NPC Northern Classic.

She defines herself as a hybrid athlete, balancing her muscle mass with endurance sports like running, biking, and open-water swimming. She also competes in kettlebell sport biathlons, achieving Rank I status. In her adult content work, she performs solo and partnered scenes, including interracial. She also offers fitness coaching and training advice. She travels internationally for events, having trained in places like Phuket, Thailand. She is 37 years old.