Celine Dion is selling $100 million in mansions. In the market?

Celine Dion is selling two of her biggest properties for $100 million total. The singer is selling her sprawling mansions in Montreal and Jupiter Island, Fl. In the market for a Celine Dion-owned mansion?

Celine Dion is cashing out of the mansion market, listing two of her trophy properties for a total of more than $100 million.

The singer is listing her Florida compound on Jupiter Island for $72 million, making it one of the most expensive listings in the state. The 5.7-acre property—which is more like a resort—has a 10,000-square-foot main house, and several other buildings totaling an additional 10,000 square feet or more.

Dion has also accepted an offer for her private-island estate near Montreal, which she listed last year. Joseph Montanaro, the broker for the Montreal property, declined to give the offer price, but the listing price is $28.2 million.

So why is Dion selling? Montanaro said she's spending most of her time in Vegas and doesn't get to the East Coast much anymore. He said she visited the Montreal property just once in the past two years. Her Florida property had been her home base before she moved to Vegas but "she's not in Florida much anymore either," Montanaro said.

Dion just re-upped her lucrative contract to perform in Las Vegas until 2019.

Even if both properties sell, Dion will still be property rich. In addition to a home in Vegas, she and her family own several other properties in the U.S. and abroad, Montanaro said.

Dion's Florida property is one of the most lavish and secure spreads in Florida. The gleaming white main house has a fitness room, home theater chef's kitchen and a finished basement. To hold Dion's massive wardrobe, the master closet has an automated clothing rack and a revolving "shoe carousel," as well as additional storage for clothing in the lower level of the home.

But the property's main feature is its land and side buildings. The 5.7-acre property has 400 linear feet of ocean frontage. It has five side buildings or "pavilions," including an eight- bedroom guest house, a tennis house with a simulated golf range, pool house and beach house with a second-floor sleeping loft.

There are three pools, including one with a water park. Montanaro said that because Dion and her kids would get mobbed by fans if they went to theme parks, she kept much of their family entertainment at their property.

The security on both properties is super-tight, with an arsenal of cameras, guard houses and gates. Montanaro said that the buyer of the Jupiter Island property could be a super-rich Russian or Latin American, or another celebrity.

"It's a great property for someone who really values privacy," he said.

—By CNBC's Robert Frank. Follow him on Twitter 

@robtfrank.