Family Plan (2005) on Netflix

After her company was taken over, Charlie Mackenzie has the right profile to get her old executive job back, except that her new boss Ed(ward) Walcott insists on being a 'family company', so when he thinks she's wearing a wedding ring (which just got stuck when she tried it on) she dares not tell him the truth. When she has to invite that boss and his wife, she hires actor Buck Maddockx to pretend being her husband Frank, the father of her (actually the friend who lend her a fine house) daughter Nicole, without any rehearsal. They get by with some daring lies, but then the Walcotts decide to rent the house next door while their Malibu residence is being remodeled...