They're already Hollywood royalty, but on Tuesday, the women of the Presley family

Elvis' ex-wife, Priscilla Presley, daughter, Lisa Marie Presley, and granddaughter, Riley Keough

made it official, with a hand and footprint ceremony at the famous TCL Chinese Theatre in Hollywood.

The trio -- along with Lisa Marie's 13-year-old twin daughters, Harper and Finley

was honored in celebration of the legacy of their famous family, as well as the upcoming release of the Elvis biopic,

directed by Baz Luhrmann and starring Austin Butler as the King of Rock and Roll himself.

Luhrmann and Butler both spoke at the ceremony, which was a moving moment for all of the members of the family

who have been outspoken in their support of the upcoming film and its portrayal of their late, iconic patriarch.

"It means a lot, absolutely, to my family and the people who knew Elvis really, really well, to be honored in this way," Priscilla told ET,

adding that the theater -- then known as the Grauman's Chinese Theatre -- was one of the first sights she saw with Elvis when she first came to Los Angeles in 1962.