Perhaps Kim Kardashian isn't quite the material girl after all.

The socialite, who turned 30 Thursday, canceled what was to be a surprise $1 million birthday cake in her honor after RadarOnline.com broke the news of the decadent delight.

"Kim was adamantly against accepting the cake," an organizer of the reality star's birthday festivities, GLO Night Club's Danielle Orsino, told RadarOnline.com exclusively. "It's a shame that she couldn't just enjoy it for what it is, a record-breaking diamond-encrusted cake gifted her, a lover of diamonds."