'Queen of Versailles' Jackie Siegel -- Lasers Scorched My Face (Horrifying Photos)

Jackie Siegel's face turned into an even bigger disaster than her nightmare of a mansion -- featured in the famous "Queen of Versailles" documentary -- when she suffered a major allergic reaction to a laser treatment.

Jackie looked like an over-cooked lobster when she got home from a skin rejuvenation session in Orlando. She tells TMZ the plan was to celebrate the end of her long-running lawsuit over the docu about her and husband David Siegel's attempt to build the biggest mansion in the U.S.

Siegel FREAKED when she saw her face, and went back to the doc, who assured her everything was okay. She says it took a long, painful week for the swelling to go down, but her face did return to normal.

They should be so lucky with Versailles. Jackie says they're STILL building and it's scheduled to be done next year.