Lisa Marie Presley has an extra special reason for gaining babyweight while pregnant - she is expecting twins. The daughter of rock 'n' roll king Elvis Presley is four-and-a-half months pregnant with her third and fourth kids - her first with fourth husband Michael Lockwood. American magazine Star claims the couple is expecting twins at the end of August (08), and state at least one will be a boy. One of Presley's California neighbours tells the tabloid, "Michael told me that he and Lisa have been trying to get pregnant for about a year. "He also said that they had a sonogram two weeks ago, and (one) baby opened its legs, and they saw something! Michael was beaming." Presley, who has two teenage children with ex-husband Danny Keogh, is currently planning to sue a publication that accused her of being fat, forcing her to reveal her pregnancy.