Will Arnett has new girlfriend Will Arnett is dating Carolyn Murphy after quietly splitting from Alessandra Brawn after five years together. 6 September 2025 Will Arnett is dating Carolyn Murphy. Will Arnett has a new girlfriend The 55-year-old actor has embarked on a new romance with the model after quietly splitting from Alessandra Brawn after five years together. Sources told People magazine that Will and Alessandra "remain committed co-parents" to their five-year-old son Denny.