Celine Dion arrives at the Academy Awards on February 27, 2011 in Hollywood, California. Credit: Steve Granitz/WireImage.com

Zee greatest singer in zee world is resuming her quest for zee greatest chateau.

Celine Dion and her hubby Rene Angelil have put their Montreal mansion on the market with Sotheby's International Realty Canada, listing it at $29,655,500 CAD (approximately $28.8 million USD).

The luxurious, custom-built 24,000 square foot home boasts six bedrooms, nine bathrooms, a massive in-ground pool, a wine cellar, an elevator, a game room--and sits on its own 830,000 square foot private island.

Why are Quebec native Dion, 44, and Angelil, 70--who have three children together, Rene-Charles, 11, and twins Eddy and Nelson, 19 months--parting with their tailor-made dream home?

"The house is being sold because of an intensive performance schedule over the next few years," reps for the couple tell Sotheby's. "The property is currently underutilized so the family is looking at downsizing into a smaller home." (Dion is currently in the midst of a three-year residency at Caesars Palace in Las Vegas).

Adds the rep, "Ms. Dion's roots and family are here in Quebec, and as such, she will maintain a residence here."