The city's Democratic establishment loathes him. But his insurgent campaign has captured the hearts (and wallets) of a surprising number of Hollywood heavyweights to become a potent mayoral wild card.

L.A. mayor candidate Spencer Pratt and wife Heidi Montag have pitched reality shows and worked to promote brands since their house burned down.

The city's Democratic establishment loathes him. But his insurgent campaign has captured the hearts (and wallets) of a surprising number of Hollywood heavyweights to become a…