Need help remembering which movie this is

It was a comedy from the 80s I believe. In it a couple is going to get married, but the bride-to-be had posed some years ago for a magazine like Playboy, but her future husband didn't know. When she went to meet his family before the wedding, I think it was his brother that asked her if he had ever met her before. It wasn't until a comedic event at the pool that the brother suddenly remembered where he saw her. Anyone remember this film?