Vince Vaughn is convinced fiancee KYLA WEBBER will be left disappointed when they become man and wife - because he refuses to change his bad habits.
The Wedding Crashers star is finally preparing to settle down, after proposing to Canadian real estate agent Webber on Valentine's Day (14Feb09).
The actor insists he's found his ideal woman - but has a harsh warning for his lover.
He says, "The only expert thing I know about a relationship is that I don't know anything.
"I do know this to be true: I know that men marry women hoping that they will not change, and women marry men hoping that they will change and inevitably, everyone's disappointed."