The 57-year-old Pirates of The Caribbean actor has won a motion ordering the American Civil Liberties Union to prove his ex-wife donated $3.5 million to the organization as she promised.
The chunk of change was reportedly donated by Heard after she scored $7 million in her divorce settlement with Depp -- but there have been no receipts to prove it.
Depp's legal team has longtime believed Heard's donation was a sham, especially because the ACLU wouldn't agree to show proof or even confirm it.
The New York Supreme Court has now ordered the charity organization to hand over documentation proving whether or not Heard stuck to her promise.
According to Daily Mail, Depp has been granted 23 out of his 24 "motion to compel" requests, which means the ACLU must now turn over the paperwork.
The judge said Depp "has satisfied the initial burden of stating the circumstances of reasons underlying the subpoena… the ACLU has failed to demonstrate that the information sought it utterly irrelevant to the action."
"Thus, for the reasons stated herein, the petition is granted and denied in part and respondents are ordered to comply with all subpoenas with the exception of… documents pertaining to Ms Heard’s role as a brand ambassador for the ACLU."
The ACLU wasn't the only charity that Heard claimed she donated her divorce settlement to.
She also declared she'd give the remaining $3.5 million to the Children’s Hospital Los Angeles.
In January, the hospital revealed devastating news by producing paperwork that allegedly showed the actress had only given $100,000 -- a staggering difference to the amount she promised.
Depp's lawyers hope the ACLU documentation will show that Heard wasn't truthful about her donation, thus she may not be honest about other accusations concerning her ex-husband.
This is definitely a small victory for the actor after he suffered a devastating blow in his defamation case against The Sun last year.
Despite their divorce being finalized in 2017, Depp and Heard are still at odds.
The ex-couple is currently gearing up to take their battle to court over a separate $50 million defamation lawsuit.