He likes to show off his trophy wife at every party.
trophy wife
idiomA wife, usually young and attractive, regarded as a status symbol for her husband, usually older and affluent.
Origin
first recorded 20th c.Popularized by Julie Connelly in a Fortune magazine cover story in 1989, by analogy with a real estate trophy building.
The wealthy businessman was often seen at high-society events accompanied by his much younger trophy wife.
Critics often dismissed her professional accomplishments, unfairly labeling her as nothing more than a trophy wife for her influential husband.