13/01/2011 07:25 GMT | Updated 22/05/2015 06:12 BST

Silver Surfers: Russell Brand, Katy Perry And Grandma

Katy Perry, her granny and Russell Brand. WireImage

Katy Perry and Russell Brand are known for their partying antics. So it's no surprise they hit the town with Perry's grandmother for her 90th birthday.

Not one to do things by halves, the singer made sure her grandma celebrated in style at the Planet Hollywood Resort in Las Vegas. She Tweeted, "Happy birthday Grandma Hudson. You're the reason why!"

Perry dressed up for the occasion in a silver sequin mini dress from Asos, while Brand stuck to his trademark suited and booted look, matching his wife's silver look. With these two leading the party, we're sure Grandma Ann had a blast.

How do you rate their Vegas style? Leave a comment below.

Passion for fashion? Follow us on Twitter and become our fan on Facebook