Amy Winehouse made changes to her will before she died, an anonymous source has told the Daily Mail.
The star was found dead in her home in Camden, North London, on July 23. Initial autopsy reports were not able to determine a cause of death and police are now waiting on toxicology reports, although they say they are not treating the case as suspicious.
The star reportedly made changes to her will following a messy divorce from her husband of two years, Blake Fielder-Civil.
Her 2006 album Back To Black was supposedly written about the former couples' rocky relationship, which ended in 2009.
The alterations were made to block Mr Fielder-Civil from receiving a share of Ms Winehouse's estate in the event of her death.
Mr Fielder-Civil is currently in prison serving a sentence of 27 months after being found guilty of assault and obstruction of justice.
Conservative estimates put the singer's fortune to be at least £6 million (around AUD$8.9 million) although it could be as high as £20 million (AUD$29 million).
Ms Winehouse had released two albums, with her most recent offering Back To Black multiplying 27 times in sales levels following news of her death.
Sources say that a third album - yet to be released - will form part of the singer's estate and will be released posthumously.
A will is reportedly in place as part of Ms Winehouse's contract with her recoding company. A source told the Daily Mail, "As a matter of course with record contracts, financial advisers will make sure that is done."
It is unknown if her ex-husband will be able to challenge a will made by Ms Winehouse, which is likely to divide her assets amongst her immediate family, including her brother Alex, mother Janis and father Mitch.
Under Australian law, family members, spouses and partners are able to apply to be the administrator of an estate if the deceased did not have a legal will in place.
This power is given to the applicant in the form of a letter of administration, which allows the holder to split the deceased person's assets according to laws of the state.
To ensure that an estate is dealt with according to your wishes, rather than by a court-appointed executor, it is strongly advised that you speak with an experienced lawyer to assist you with the estate planning process.