Kate Middleton to Sleep on the Streets Duchess of Cambridge wants to raise awareness of homeless youth By Evann Gastaldo, Newser Staff Posted Jun 29, 2012 10:24 AM CDT 17 comments Comments Catherine, Duchess of Cambridge leaves by carriage after attending the annual Order of the Garter Service at St George's Chapel on June 18, 2011 in Windsor, England. (Getty Images) (Newser) – Kate Middleton is royalty now, but she's not above spending a night on the streets of London. She'll join Centrepoint, a charity supporting homeless youth, for its next Sleep Out campaign to raise awareness of the increasing homeless problem, according to Lisa Maxwell, an ambassador for the group. Prince William is a patron of the charity, as was mom Princess Diana before him; he has already taken part in a Sleep Out campaign, the Mirror reports. Maxwell recently met Kate at a party and told her, "Next time I do it, you’re doing it with me. No excuses, he's done it." Kate's reply: "You’re on." While the Duchess of Cambridge is on the streets, her parents will be living in luxury, thanks to Wills: The prince reportedly put quite a bit of money toward a down payment on a $7.3 million estate his in-laws are purchasing, the Chicago Sun-Times reports. "Supposedly the Middletons are multi-millionaires from their mail-order party supply business," notes one source. "Why do they need extra cash from William? Are they perhaps a bit over-extended financially—trying to keep up with their new royal relatives?"