UPDATE 6.15pm: Lady Gaga touched down in Perth this evening.
Gaga, or Mother Monster as she is known to her die-hard fans, landed a little later than expected just after 6pm and was quickly ushered into an awaiting car.
The Born This Way singer then headed to Burswood Entertainment Complex, where she is expected to stay while in Perth for her shows at the Burswood Dome on Saturday and Sunday.
Clad in a black dress, black stiletto platform boots and black sunglasses, Gaga stopped to mingle with about 200 fans waiting to meet her outside Burswood Casino.
She spent about five minutes signing autographs and shaking hands with her "monsters".
Earlier today she tweeted a picture of herself on her way to WA.
Gaga uploaded the picture, which appears to show the singer in her private jet.
In Brisbane, Sydney and Melbourne, Gaga briefly met fans as she entered her hotel.