She is set to wow crowds in Brisbane with her Witness concert on Friday night.

But ahead of the big show, the 33-year-old singer made a special appearance at a Westfield shopping centre in Carindale.

The American singer waved to fans as she made her way out onto the pink stage to meet with emcee Scott Tweedie.

She cut a sophisticated figure in a white military-inspired mini skirt which flaunted her toned pins.

She paired the attire with a matching peplum style button-up top.

The platinum blonde accessorised her ensemble with black hoop earrings and for makeup, the stunner opted for a dramatic eye with lashings of mascara and bold eyeliner to highlight her blue eyes.

Meanwhile, Katy’s choppy pixie cut was styled in a messy look.

As the Roar hit maker approached the stage to met with Scott, she struck a fierce pose for her fans, showing off her strappy peach pink and white heels.

While posing for her Katy Cats (her fan group’s name) she appeared to lose her stepping but was luckily helped by the host.

After chatting with Scott, the Grammy nominated singer met with her fans eagerly waiting for her off stage for selfies and to sign autographs.

Katy has been in the Queensland capital for the past few days for her shows at the Brisbane Entertainment Centre.

Aside from working hard at rehearsals, she has enjoyed some downtime whale watching with her entourage.

A couple of days before that the Swish Swish songstress visited the Dreamworld theme park on the Gold Coast.

Katy will fly out to Sydney for the final four concerts of her Australian tour, before heading over to New Zealand for two shows in Auckland.