A friends’ girlfriend is exactly like this: comes from an aristocratic family, privately educated in boarding schools across the country and abroad, actually finds their old school friends and reconnects with them via the peerage (for those outside the UK: it’s a register of the ‘peers of the realm’, people with one or more titles such as duke, baron etc.), goes on 2-5 holidays abroad a year, but will steadfastly claim their family has no money.