The teen daughter of billionaire “Queen of Versailles” couple David and Jackie Siegel battled with an addiction to pills and returned home from rehab just weeks before her death, a family spokesman told The New York Post.

“At this time we are assuming that there was an overdose,” family lawyer Michael Marder said about Victoria Siegel, who was found dead Saturday after being discovered unresponsive in her family’s Central Florida mansion.

“Victoria was in rehab and was prescribed medication but we do not know what was in her system at the time of her death or what the actual cause of death was,” Marder added.

Sources told TMZ that Victoria struggled with Xanax, but was doing better since returning home from rehab about two weeks ago.

An autopsy on Siegel, 18, was completed Monday, according to the Orange-Osceola Medical Examiner’s Office, which is awaiting toxicology results that could take eight to 12 weeks.

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Victoria was found in the family’s 26,000-square-foot Seagull Island home on Green Island Cove, close to where family patriarch David Siegel — who struck it rich as the founder of time-share company Westgate Resorts — was attempting to build a 90,000-square-foot mansion, the largest single-family home in the nation.

The ostentatious domicile — which has not been completed because of financial setbacks in the wake of the 2009 economic crisis — was the subject of the 2012 documentary “The Queen of Versailles.”

The documentary revealed Jackie’s hands-off parenting approach, despite having eight children, including Victoria.

“Nothing’s really normal about this life,” Victoria said in the film.

Jackie Siegel appeared last week on an episode of ABC’s reality-TV show “Celebrity Wife Swap,” where she traded places with actress Juliet Reeves London, wife of “Party of Five” actor Jeremy London. The show featured Jackie struggling to fit in on London’s Oklahoma farm and learning a lesson in the value of family time.

“Juliet and I got to know Victoria,” London tweeted. “She was a beautiful soul who was in obvious pain. Teen angst is brutally real. Speak with your kids often.”

Juliet London said she didn’t see anything to indicate Victoria was troubled. “I didn’t see signs at all,” she told Radar Online. “I don’t know about her struggles as she seemed to be in a good place.”

“She called me ‘mom’ even after the show,” Juliet told the site. “I thought it was cute.”

“I am utterly heartbroken,” she continued. She said, saying the “private” teen preferred to stay off camera during the “Wife Swap” shoot.

“She was there most of the time and was very helpful,” the actress said of Victoria, who went by “Rikki” to friends and family. “She was genuinely kind and very intellectual and artistic.”

A public memorial will be held for Victoria on 2 p.m. Tuesday in Orlando.

This article originally appeared in the New York Post's Page Six.