08/27/2009 at 09:10 PM EDT
He's only a week old but actress AJ Langer's son, Jack Haydon Langer Courtenay, already has some big shoes to fill.
Jack, born Aug. 16 in Los Angeles, becomes second in line to the English title "Lord Devon" – dad Charlie Courtenay is the son and heir of Earl of Devon – which dates back to the 16th century during the reign of Mary Tudor, Henry VIII's oldest daughter.
Langer, 35, best known for her role as Rayanne on the TV series My So-Called Life, married Courtenay, an L.A. lawyer and the future Earl of Devon, in 2004. "We met in a bar in Vegas," Langer has said. "He didn't know I was an actress. I didn't know he had a castle."
The couple, who also have a 2-year-old daughter, Joscelyn Skye, plan to move to the Powderham Castle in Devon, England, where the proud grandparents raised a blue pennant on the flag pole in Jack's honor.