Katy Perry has been in her Australia the past two weeks for her Witness world tour.

And on Sunday the 33-year-old stopped by Melbourne’s Southland Shopping Centre for a Q&A session.

Before entering the event, the Teenage Dream singer looked more like a tangerine dream in an avant-garde, structured orange dress.

Strapless, pinched in at the waist and flaring in gentle folds, the outfit was indeed eye-catching.

The I Kissed A Girl singer paired the dress with a short, crumpled vinyl jacket, which matched her patent leather heels and black hoop earrings.

With her ash toned hair styled in a tall coif, Katy wore a smoky eye and pale pink lip to complete the look.

Taking time for her fans on the way into the venue, the Firework hitmaker stopped to take selfies with the hordes of fans gathered at the venue.

She used a fan’s phone to take one of the snaps while her delighted admirers beamed behind her.

Known for her good deeds, the appearance comes after Katy gave a private concert to a young cancer-stricken superfan on Tuesday.

The American pop star has shared an emotional video of her day with eight-year-old little girl Grace at her home in Adelaide, where she is recovering from brain surgery.

Footage posted on the singer’s official Facebook on Friday, shows her meeting Grace’s family, embracing the youngster and getting a tour of Grace’s bedroom.

Katy and her two guitarists then delighted the young girl and her family with a private acoustic concert of her hit songs, including Firework.