Come and knock on our door , we’ve been waiting for you — if you’re ready to romp! The newest cruise ship craze is Mrs. Roper Romp , a kooky get-together in which passengers dress up as the flamboyant “Three’s Company” character, complete with super-sized sunglasses, orange wigs, multicolored muumuus — and plenty of oversized jewelry. Royal Caribbean, Holland America and Carnival Cruises are all sailing full steam ahead with the fad. The fad, based on Audrey Lindley’s colorful character from “Three’s Company,” sees fans dressing up in her image. Courtesy Everett Collection “It’s a lot of fun, and it’s turned into a phenomenon,” John Heald, brand ambassador for Carnival Cruise Line, told The Post. Heald even embraced the mania in a playful Instagram post donning an orange wig, flowered frock, nautical knots of necklaces and a hilarious caption in which he jokes, “I’m sorry, but this Cruise phenomenon of dressing as Mrs. Roper is getting out of control and needs to be stopped now!!!” The Mrs.…