Katy Perry gate crashes Aussie Formal (Prom)

http://www.adelaidenow.com.au/news/national/katy-perry-ruby-rose-gatecrash-melbourne-high-school-formal/story-e6frea8c-1225905646853

US HIT maker Katy Perry added some serious star power to the Melbourne High School formal at the Grand Hyatt on Friday night, crashing the event with her Aussie gal pal Ruby Rose.

The dynamic duo were out on the town and decided to make a surprise appearance at the event, slipping in to the hotel's ballroom through a back door around 11pm, just as her hit single California Gurls began to play.

Perry grabbed a microphone and waded through the sea of students on the dancefloor before she began singing along to her track.

Not surprisingly, the teenagers went nuts when they realised they had a superstar in their midst.

Perry did not linger long after her song finished, but posed for plenty of pics before dashing out the door with Rose.

Pity the poor person booking the entertainment at MHS's formal next year - Perry is going to be a tough act to top.

"I don't know who's year 12 formal it was but nothing was going to stop @katyperry...,'' Rose wrote on her Twitter page.

Party girl Perry acknowledged her gatecrashing: "I totes just crashed a prom!!!'' she Tweeted.

The pair continued their big night on the town, having a good time at the Spice Market nightclub at the Grand Hyatt and then Boutique nightclub in Prahran.

Perry left Melbourne yesterday and is now in Tokyo.