'The whole time it's been me': Katy Perry jokes she is the real Sia as she plays with the hitmaker's wig after scarfing down a loaded hot dog 

Katy Perry munched on a hot dog and playfully donned a Sia wig while catching the Australian singer's recent concert in Los Angeles.

The 31-year-old pop star took to Instagram to document seeing Sia over the weekend at the Hollywood Bowl with her older sister.

A video showed Katy wearing a face-concealing black and blonde Sia wig before showing her face and saying, 'Hey guys, the whole time it's been me, Katy Perry!'

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Music fan: Katy Perry shared video on Instagram of herself enjoying the recent Sia concert in Los Angeles and a hot dog

Music fan: Katy Perry shared video on Instagram of herself enjoying the recent Sia concert in Los Angeles and a hot dog

Katy also was shown in a video eating a hot dog with mustard and ketchup during the show.

The singer pulled a funny face while trying to enjoy her hot dog. 

Her video also showed her older sister Angela along with the caption 'sisters night out'.

The Firework singer also shared a clip of Sia performing on the Hollywood Bowl stage. 

She's funny: The pop star joked around with a black and blonde Sia wig

She's funny: The pop star joked around with a black and blonde Sia wig

Whole time: Katy joked that the whole time it's been her under the Sia wig

Whole time: Katy joked that the whole time it's been her under the Sia wig

Katy's song Double Rainbow from her Prism album was co-written with Sia, 40, and Greg Kurstin.

Sia, full name Sia Furler, has written several hit songs for other artists including David Guetta's Titanium and Rihanna's Diamonds.

The Australian singer embarked on her 23-date Nostalgic For The Present Tour in September in Seattle. 

Having fun: The Firework singer pulled a funny face while enjoying her hot dog

Having fun: The Firework singer pulled a funny face while enjoying her hot dog

Big sister: It was 'sisters night out' as Katy took in the concert with her older sister Angela

Big sister: It was 'sisters night out' as Katy took in the concert with her older sister Angela

Sia wears her signature black and blonde wig that covers the upper half of her face during her performances.

The tour is scheduled to conclude on November 6 in Austin, Texas.

Katy earlier this month also attended the Dolly Parton at the Hollywood Bowl and also shared an Instagram video of herself wolfing down a hot dog.

On the road: Katy also showed Sia, who has been on the road in support of her seventh studio album This Is Acting

On the road: Katy also showed Sia, who has been on the road in support of her seventh studio album This Is Acting

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