“Real Housewives of DC” star Cat Ommanney said her “long and lovely” kiss with Prince Harry in 2006 was not the tryst her former nanny, Monica Herrero, recounted to RadarOnline.com last week. Herrero said Ommanney bragged about chauffeured dates with Harry and promises from the prince, who’s 13 years her junior, to take her hand and travel the world. But Ommanney tells Page Six, “Monica H was an au pair whom I fired because she was irresponsible and untrustworthy. She also had a house party when I was away for the weekend with the girls and completely trashed our home as well as running up an $800 phone bill! Her allegations are all lies.”