Get your skates on! Katy Perry and Amber Heard go back to the 90s and hit the roller disco for their friend's birthday bash

As Hollywood stars, Katy Perry and Amber Heard are used to the best of the best when it comes to where they choose to party.
But over the weekend the duo looked like they were having the time of their lives as they tried something a little bit different.
The pair joined a host of other stars in attending their pal Johnny Wujek’s birthday bash, which was held at a roller disco.

Famous friends: Katy Perry (L) and Amber Heard attended Johnny Wujek's roller birthday party over the weekend

The party for the celebrity stylist and new mentor on America’s Next Top Model took place at Los Angeles’ Moonlight Rollerway on Saturday night.
Katy in particular dressed for the occasion and sported a full-on Nineties inspired ensemble.
She wore a floral crop top and matching leggings along with denim shorts and a pair of pink retro cat-eye sunglasses.

Retro rules: The guests were instructed to dress in Nineties outfits by celebrity stylist Johnny (R)

Wheel-y fun: Katy came armed with Beanie Babies and looked like she was having a fantastic time

But Katy made sure her outfit stood out above anyone else’s as she slung a rucksack on her back which was open and stuffed to the brim with Beanie Babies.
The 27-year-old was clearly thrilled with her creation as she took to her Twitter page to post: ‘Bringing beanie babies back.’
While Amber, 26, also conformed to the Nineties theme, her look was a little less out-there.
She donned a lacy top and ripped denim Daisy Dukes, topping off her look with a high ponytail and a slick of bright pink lipstick.

Birthday kiss: Amber planted a smooch on Johnny, who is joining America's Next Top Model as a mentor

Low-key: Hayden Christensen and Rachel Bilson didn't dress to impress and instead kept things casual

Pop stars: Katy was also spotted cuddling up to fellow singer Daniel Bedingfield for a photo

Hayden Christensen and Rachel Bilson were also in attendance but went low-key in denim outfits.
Katy showed how close she and Johnny are as she helped to cover his cake with candles and led the crowd in singing him Happy Birthday.
The Wide Awake singer was spotted having a fantastic time with her pals and at one point was seen cuddling up to Daniel Bedingfield for a photo.
It’s no wonder the star was in such good spirits as yesterday marked the day her divorce from Russell Brand was finalised after a 14-month marriage which ended at the end of last year.

Great friends: Katy helped light the candles on Johnny's giant birthday cake

Follow the leader: Katy then proceeded to lead the crowd in a rendition of Happy Birthday

Just roll with it: Katy and Johnny showed they are pros on roller skates and zoomed around the arena side by side