The Southern girl performed in Australia for the first time in eight years, showcasing her new blues and roots album, Storm and Grace, to a 600-strong audience.
But the RSL's website warned: 'Patrons dressed as Elvis or Michael Jackson will NOT be allowed to attend the meet and greet under any circumstances'.
Hornsby RSL assistant CEO Steve Rigney said: 'We'd hope people would respect her for her music talents, that's what she's here for, her album'.
And respect her they did, with cries of 'I love you' ringing out as the petite singer in a long, black gown and bare feet took to the stage.
'I made a mistake', Presley said in laid-back Southern fashion. 'I came out here with no shoes, I thought there was carpet. So if I slip, I slip'.
With a microphone in one hand and tambourine in the other she performed a majority of songs from Storm and Grace. Lights Out, S.O.B. and I'll Figure It Out from her first two albums - 2005's Now What and 2003's To Whom It May Concern - were also thrown in.
'The live show is a lot more energetic than the record - it's a little more loud and lively', Presley said. 'I start off mildly, really break it down for the acoustic, and then we just get louder and louder and louder and take it home'.
Before the performance she enjoyed a day out at Taronga Zoo with twin daughters Harper and Finley, 5, and 24-year-old daughter Riley Keough.
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