Lisa Rinna: Sorry About Harry Hamlin's Swastika ... Just Keeping it Real

Lisa Rinna is apologizing for her husband Harry Hamlin, stepping out with a giant Swastika across his chest ... but her excuse probably won't sit well with anyone who was offended.

Lisa and Harry dressed up as the Sex Pistols' Sid Vicious and his gf Nancy Spungen for the Casamigos Halloween bash, and as you can imagine ... Harry's getup pissed off a lot of people.

Lisa says they were just trying to be authentic ... recreating a classic 1978 pic of Sid and Nancy. She says they didn't mean to offend anybody. However, when we got them out Saturday night, Harry changed his shirt, but was hardly apologetic for the Swastika.

Interestingly, even the 1986 biopic "Sid and Nancy" avoided this kind of PR nightmare -- replacing the Nazi symbol with the Soviet hammer and sickle.