No — there is no reliable public source currently confirming Jamie-Lynn Sigler is left-handed. Her handedness is unknown.

Jamie-Lynn Sigler is an American actress and singer, best known for her role as Meadow Soprano on the critically acclaimed HBO crime drama series "The Sopranos." Her portrayal of the mob boss's daughter brought her widespread recognition early in her career.

Born in Jericho, New York, Sigler began acting in regional theater productions at a young age. After "The Sopranos," she continued to work in television and film, appearing in various shows and movies, including "Entourage" and "Ugly Betty."

In addition to her acting career, Sigler also ventured into music, releasing a pop album titled "Here to Heaven" in 2001. She has also been involved in several charitable causes and public speaking engagements, particularly concerning her battle with multiple sclerosis.

Sigler publicly revealed her diagnosis with multiple sclerosis in 2016, having been living with the condition since she was 20. She has since become an advocate for MS awareness, sharing her experiences and inspiring others with chronic illnesses.