Daphne Barak, the journalist claiming Kevin Federline linked Britney Spears to crystal meth, has come below heavy fireplace from the previous couple … however she’s not backing down, insisting Okay-Fed made the assertion, regardless of his denial.

A spokesperson for Mail on Sunday tells us Daphne and her crew spent months engaged on a documentary with Kevin, his household and Britney’s two sons — Sean Preston and Jayden.

The rep says, “Daphne Barak has assured us that the quotes attributed to Kevin and the household are correct and pretty mirror the interviews performed, during which Kevin expressed his fears that Britney may be utilizing crystal meth to Daphne and to her producer Erbil Gunasti and members of the movie crew. He did so clearly and repeatedly.”

They proceed, “Kevin additionally made it clear to Daphne that he hoped somebody would expose the state of affairs, as he noticed it, as a result of that might be the best way to get assist for Britney.”

What’s extra — they are saying they reached out to Britney’s reps for feedback on the meth allegation … however received no response.

TMZ broke the story — Federline went scorched Earth on The Solar and Every day Mail Sunday after a report claimed he said about Britney, “I concern she’s on meth – I have been praying somebody would make it public and that she wakes up … It is terrifying. She is the mom of my boys.”

After the story got here out, Kevin advised us, “It saddens our household that Daphne Barak and Erbil Gunasti have determined to manufacture lies and publish the guts ache our household has endured, together with the trauma of our minor youngsters.”