Lisa Marie Presley and her children pay tribute to Elvis at Graceland on 40th anniversary of his death

Elvis Presley is gone but certainly not forgotten.

Wednesday, Aug. 16, marks the 40th anniversary of Elvis' death at age 42, and fans from around the world have been paying tribute to the King of Rock 'n' Roll, along with his family members.

WATCH: Priscilla Presley Opens Up About Spending Teenage Years With Elvis, Says He Never Saw Her Without Makeup

Elvis' daughter, Lisa Marie Presley, took her 8-year-old twin daughters, Harper and Finley Lockwood, and her 24-year-old son, Benjamin Keough, to Graceland -- the former home of Elvis -- to pay tribute to the late singer at a candlelight vigil with fans. Lisa Marie, 49, wore a crimson satin dress, while her twins were dressed in similar white and pink dresses. Her son wore a black blazer and jeans, along with a tan shirt and boots.

Harper Lockwood, Lisa Marie Presley, Finley Lockwood, and Ben Keough at Graceland in Memphis, Tennessee. Elvis Presley Enterprises/Graceland

On Wednesday morning, Lisa Marie's mother, Priscilla Presley, posted photos of herself and her daughter at Elvis' funeral in 1977. She captioned the photos: "Mourning."

15 PHOTOS
Elvis Presley and wife Priscilla Presley
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Elvis Presley and wife Priscilla Presley
(Original Caption) 5/1/1967-Las Vegas, NV: Elvis Presley gives his new bride, Priscilla Ann Beaulieu, a kiss following their wedding. The bride wears a large diamond on her finger.
(Original Caption) Las Vegas, Nev..Entertainer, Elvis Presley sits cheek to cheek wit his bride, the former Priscilla Ann Beaulieu, following their wedding May 1, 1967.
UNITED STATES - MAY 01: Wedding Photos of Elvis Presley to Priscilla on May 01,1967 (Photo by Michael Ochs Archives/Getty Images)
Portrait of American rock and roll singer Elvis Presley (1935 - 1977) and his girlfriend and later wife Priscilla Beaulieu, 1960s. (Photo by Max B. Miller/Fotos International/Getty Images)
Newlyweds Elvis and Priscilla Presley, who met while Elvis was in the Army, prepare to board their private jet following their wedding at the Aladdin Resort and Casino in Las Vegas.
Priscilla Presley, Lisa Marie Presley & Elvis Presley in Hawaii, California (Photo by Magma Agency/WireImage)
American actress Priscilla Presley, who was married to Elvis Presley from 1967 to 1973, circa 1975. (Photo by Terry O'Neill/Hulton Archive/Getty Images)
American actress Priscilla Presley, who was married to Elvis Presley from 1967 to 1973, circa 1975. (Photo by Terry O'Neill/Hulton Archive/Getty Images)
(Original Caption) Entertainer Elvis Presley leaves Santa Monica California Superior Court after being granted a divorce from his wife Priscilla. The couple had been married six years and in spite of the October 9 divorce proceedings, they appeared very amicable as they left the courtroom.
American actress Priscilla Presley, who was married to Elvis Presley from 1967 to 1973, circa 1975. (Photo by Terry O'Neill/Hulton Archive/Getty Images)
UNITED STATES - JANUARY 01: (AUSTRALIA OUT) USA Photo of Lisa-Marie PRESLEY and Priscilla PRESLEY and Elvis PRESLEY, with his wife Priscilla and daughter Lisa-Marie - c.1970 (Photo by GAB Archive/Redferns)
LOS ANGELES, CA - 1988: Actress and former wife of Elvis Presley, Priscilla Presley, poses during a 1988 Los Angeles, California, break in filming of 'The Naked Gun.' Presley starred with Leslie Nielsen in the three cop spoofs. (Photo by George Rose/Getty Images)
MEMPHIS, TN - MAY 4: Priscilla Presley gives a press conference to announce Elvis Presley's home, Graceland Mansion, will open to the public on June 7, 1982 as a memorial museum on May 4, 1982 at Graceland in Memphis, Tennessee. (Photo by Ron Galella/WireImage)
Priscilla Presley, Chairwoman of Elvis Presley Enterprises, pictured at news press conference to promote Elvis Presley Showtime TV Special, Memphis, Tennessee, USA, 4th January 1985. (Photo by Eddie Sanderson/Mirrorpix/Getty Images)
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Prior to Lisa Marie taking her family to Graceland, Priscilla -- who was married to Elvis from 1967 to 1973 -- gave ET a tour of the $45 million expansion of the estate in Memphis, Tennessee. Check out our exclusive look back at Elvis' life through the eyes of his former wife:

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