Keough, Austin Butler, and Elvis director Baz Luhrmann joined Presley as they celebrated what would've been her late father's 88th birthday Sunday Brenton Blanchet is a writer-reporter at PEOPLE.

In an exclusive tribute, the Guns N' Roses rocker remembers his longtime friend Lisa Marie Presley after her heartbreaking death at 54 Rachel DeSantis is a senior writer on the music team at PEOPLE.