By Debbie Emery - Breaking Celebrity News Reporter

The court battle over artist Thomas Kinkade's millions began on Monday with the judge ruling that it will not be conducted behind closed doors as his widow had requested.

Nanette Kinkade had asked to have the case kept private and for it to be sent to an arbitration panel and not open probate court but Judge Thomas Cain refused, and gave all involved a break from the Santa Clara County Superior Court in California until August 13, reported the San Jose Mercury News.

As Breaking Celebrity News previously reported, Kinkade's wife of 30 years is fighting claims by his mistress, Amy Pinto-Walsh, that he bequeathed her his mansion in Monte Sereno and $10 million to establish a museum of his paintings.

The critically maligned but commercially successful artist, who battled alcoholism for three decades, had been legally separated from Nanette for two years before his death April 6. Pinto has said that she and Thomas were planning a Fuji wedding as soon as he divorced.

"You're asking me to make findings based on very limited information," Cain said to both parties during Monday's proceedings, which Pinto-Walsh attended but Nanette did not.

The basis of Pinto-Walsh's claim to the estate is two handwritten wills -- both barely legible. The first, dated November 18, 2011, states that Thomas Kinkade, "being of sound mind and body," bequeathed his house and $10 million cash to Pinto-Walsh.