Kelly Clarkson can now ‘breakaway” from Brandon Blackstock.   Kelly Clarkson’s prenup has been validated by the judge in her divorce case, she found out the good news while she was on the set of “The Voice” and let out a scream, which then gave way to a celebration. TMZ has learned.   Sources with direct knowledge tell TMZ . Kelly was filming the singing competition Wednesday when she got an email saying the hotly-contested prenup was upheld in full by the judge. We’re told the prenup segregates all assets and income derived during her marriage to Brandon Blackstock.   Kelly accumulated the lion’s share of assets, including the Montana ranch where Brandon is currently living. He was contesting the prenup and wanted their properties split, along with income she earned during their marriage, but the judge shut him down.  We’re told the celebration on the set of “The Voice” got personal. Our sources say Blake Shelton had recently terminated his relationship with Blackstock, who managed him for years. Kelly has been awarded primary custody on a temporary basis, because Brandon moved to Montana. As for the ranch, because the prenup was validated, Kelly — who purchased it — now has the right to sell it.