Latest 28++ Lily James Mamma Mia Premiere Hair. | lily james amanda seyfried join mamma mia sequel cast at lily james and amanda seyfried are gorgeous as they strike a pose on the blue carpet at the gala premiere of their anticipated film mamma mia! You guys i can't even explain how much i adore mamma mia and the brand new sequel starring lily james! Lily james, 29, looked every inch the leading lady in a strapless ivory gown as she left her hotel and headed to the premiere of sequel mamma mia!