Katy Perry is very close with her family!

The singer, and her husband Russell Brand, joined Ann Hudson for a party in Las Vegas on Wednesday, to mark her 90th!!!

They celebrated at the Strip House steak house in Planet Hollywood's Resort and Casino.

Katy shouted out her love for her granma on Twitter:

'Happy 90th birthday Grandma Hudson. You're the reason why!' she tweeted.

Pretty funny, huh? Can you imagine taking your grandmother to Vegas?

photos: dailymail