Elvis and Priscilla met on September 13, 1959, during a party at Elvis' home in Bad Nauheim, Germany, during his stay in the army. Despite her being 14 years old, she made a huge impression on Elvis with her much older appearance. Elvis allegedly regressed to acting like an "awkward, embarrassed" boy-next-door figure in front of her. However, by the end of the evening he had managed to compose himself.
Despite Priscilla's parents being angered by her late return home during that first meeting and insisting that she would never meet Elvis again, his eagerness for another meeting, and his promise never to bring her home late again, led them to relent. They were frequently together until Elvis left Germany in March 1960. After Elvis left Germany, Priscilla was inundated with requests for interviews from media outlets around the world. She received fan mail from Elvis fans, some nice and some not so nice, as well as mail from "lonesome G.I.'s". Convinced she would never see Elvis again, and with rumors of his ongoing relationship with Nancy Sinatra flying around the gossip magazines, Priscilla resigned herself to the fact that her whirlwind romance was over.
After Elvis' return to America, the couple stayed in contact over the phone, though they would not see each other again until the summer of 1962, when Priscilla's parents agreed to let her visit for two weeks. Priscilla's parents allowed her to go only if Elvis would pay for a first-class round trip, arrange for her to be chaperoned at all times, and that she write home every day. Elvis agreed to all these demands and Priscilla flew to Los Angeles. Elvis told her that they were going to Las Vegas and, to throw her parents off the scent, he had Priscilla write a postcard for every day they would be gone so that they could be mailed from Los Angeles by a member of his staff.
It was during this visit, whilst on a trip to Las Vegas, that Priscilla first took amphetamines and sleeping pills to keep up with Elvis' lifestyle. After another visit at Christmas, Priscilla's parents finally let her move to America for good in March 1963. Part of the agreement was that she would attend an all-girls Catholic school, the Immaculate Conception High School, and live with Elvis' father and his stepmother in a separate house on the Graceland estate until she graduated from high school. Part of the agreement also was that they would eventually marry. However, after a few weeks, she was moved into Graceland to be with Elvis, although her parents did eventually agree to her living there if Elvis promised to marry her. Priscilla later said, "The move was natural. I was there all the time anyway".
Priscilla was always keen to go to Hollywood with Elvis, but he kept telling her that he was too busy for that and she was made to stay in Memphis. During the filming of Viva Las Vegas, Elvis began an affair with his co-star Ann-Margret. When Priscilla read of these reports in the press, she confronted Elvis. He told her that they were simply rumors to promote the film and that she should not believe everything that she read in the press. For the next few years, Elvis would have relationships with many of his leading ladies and co-stars, all the while denying their existence to Priscilla. Eventually she was allowed to visit him in Hollywood, but her visits were kept short.
Shortly before Christmas 1966, Elvis proposed to Priscilla. After originally setting a date "over the holidays", Elvis pushed the wedding back a few months and they married on May 1, 1967, at the Aladdin Hotel in Las Vegas. The wedding, arranged by Parker to maximize publicity, featured very few guests and was over in only eight minutes. It was followed by a quick press conference and a $10,000 breakfast reception, attended by friends, family, and business associates from MGM, RCA, and the William Morris Agency.