It has been all over the news -- The Pop Diva, Mariah Carey Sells Bel-Air Mansion in Los Angeles for $9M -- but is Nick Cannon the last one to know? 

Curbed reported on Monday that the Bel-Air Mansion on a 13,000 sq. ft LA estate was sold for $9M. The Bel-Air Mansion formerly belonged to the famous singer and songwriter, Mariah Carey and her estranged husband, Nick Cannon, the "America's Got Talent" host.

Aside from seven bedrooms and nine bathrooms, the new buyers got themselves a luxury estate with a music studio, home theater, basketball court, seven fireplaces, and a pool with "MCN" initials.

The new buyers, a heart specialist and a dentist, bought the home because they wanted something unique, says Complex. Forbes says the buyers are Rudy Rezzadeh, a New York City-based doctor, and his wife Niki, who are relocating to LA. The buyer's agent is Ardavan Mofid of Coldwell Banker Previews International.

However, as soon as the sale was confirmed Nick Cannon cried foul over the $9M dollar Mansion deal, saying that his participation in the actual sale of this luxury property was overlooked, TMZ reports. Daily Mail states that Nick is upset because he claims their business manager, Michael Kane did not involve him during the sale.

According to TMZ Cannon bravely confirms that "Mariah Carey's Manager [Kane] has been doing the negotiations without his knowledge." With that, the TV personality filed a lawsuit against Mariah Carey's property manager.

TMZ reports that Cannon "never authorized the sale". He claims that he only discovered it "after everything was finalized."

E! Online supports such, saying that according to documents procured by the entertainment news outlet, Cannon claims "he was not informed of the house's sale or of the closing date until Feb. 24." 

Mimi's estranged husband also says that he has "no objection" to selling the home, notes E! Online. He just relates that "initial efforts to obtain copies of the Purchase and Sale Agreement and other documents pertinent to the transaction were rebuffed by Kane." 

He also "asks that the money from the sale of the Bel-Air Mansion to be frozen" until he gets an accounting of "how this amount will be divided," according to the lawsuit, as cited by TMZ.

Carey's manager has since responded to the issue. In Mr. Kane's own words, the lawsuit is "frivolous and clearly a desperate act from a sadly desperate man", quotes TMZ.

According to Amanda McMullen of SF Gate Home Guides, in a community state like California, where the Bel-Air Estate is located, a husband must inform his wife of his intention to sell a property, and vice versa because "all marital property" are considered "to be the property of both spouses. Both parties must give their permission before ownership of the property can pass to someone else".

SF Gate Home Guides' Jeannine Mancini also says that even an ex-husband and a wife must review offers and agree on the price of the property they are selling if it was acquired during the state of their marriage. They are also required to attend the closing and sign the papers indicating the transfer of documents.

If the allegations of Nick Cannon are true, then he has a good case against his estranged wife's business manager or even Carey herself.