A $US3200 ($3212) cake stolen from Paris Hilton's Los Angeles birthday celebrations last week has been donated to the homeless by the thief.

The gateaux grabber, who identified himself as Paz in a cheeky, boastful post on Facebook, managed to sneak into Hilton's pre-30th birthday bash last Tuesday and made off with the uneaten cake minutes after the socialite blew out the candles.

Takes the cake ... TV presenter Wendy Williams over-compensates for Paris's birthday burglary.

In the online post, he wrote, "I woke up this morning with a birthday cake in my living room. It's big. It's red. It says 'Paris'. And it's f***ing delicious."

But now Paz has sliced up the cake and served it to the homeless on the streets of Downtown Los Angeles.