Shakira — My Ex Is a Liar … AND I CAN PROVE IT!!!

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It”s a good thing Shakira keeps her old emails … “cause the pop star says she found an old cyber-exchange that proves her ex-BF is lying through his Argentinian teeth in his $250 million lawsuit.

Shakira has filed a declaration in her legal war with Antonio De La Rua — who she dated from 2000 to 2010 — in which she adamantly denies A.D.L.R. has any right to her fortune, despite his claim that he”s entitled to a cut of her businesses.

FYI — A.D.L.R. claims he wasn”t just Shak”s lover, he was also her business adviser and says she owes him a quarter of a BILLION dollars … based on an oral agreement the two struck back in 2004.

But Shakira is calling B.S. on Antonio … claiming in 2011, he sent her an email in which he couldn”t have made it any clearer — “I am not a partner in any of your companies. You are the sole owner of all of them.”

Shakira says he sent a similar email to her mother.

In the legal docs, filed in L.A. County Superior Court, Shakira also says she had hammered out a relationship contract back in 2006 — the equivalent of a prenup — that spelled out their financial obligations to one another in case they broke up.

According to Shakira, both parties agreed back in “06 to create a joint account worth $10k … which they would split if they broke up. Shakira says they also agreed to “renounce” any rights to future earnings.

Shakira explains the point of the contract was to prevent a stupid lawsuit … like the one Antonio has filed.

The case is due back in court later this month.