S3, E24: With Charlie and Mia (recurring guest star Emmanuelle Vaugier) arranging their wedding, their families meet, and things immediately begin to fall apart. Rose takes Charlie's engagement news hard and makes some interesting plans of her own. There is also the question of where Alan and Jake will live after Charlie and Mia get married. Ultimately, Charlie and his bride-to-be end up deciding on a small ceremony in Vegas--but the surprises don't end there.