Credit: Denise Truscello/

Like grandmother, like granddaughter!

Katy Perry's not the only bling-tastic woman in her family.

The "Fireworks" singer's grandmother, Ann Russell, celebrated her 90th birthday on Wednesday -- in Las Vegas, naturally.

Joined by Perry, 26, Perry's husband Russell Brand and other family members, the grandmother partied at the Strip House restaurant at Planet Hollywood.

The matriarch's most eye-catching accessory: Her bedazzled, bejeweled walking cane!

"Happy 90th birthday grandma HUDSON! ," Perry Tweeted after the fete. "You're the reason why!"