The estate of the late American artist, Thomas Kinkade, has become embroiled in a court battle, as his widow and girlfriend argue over the validity of two handwritten wills.

According to the Daily Mail, Thomas Kinkade died of an accidental overdose earlier this year, leaving behind an estate worth an estimated $60 million. At the time of his death, Kinkade had been separated from his wife for two years, and was living with his girlfriend, Amy Pinto-Walsh.

At issue is the validity of two handwritten wills, which leave various properties to Ms Pinto-Walsh, along with a $10 million bequest to set up a museum of his artwork. Mrs Kinkade argues that the original estate plan, set up by her and her husband, is the one that should apply.