Amina Muaddi addressed reports of Rihanna and A$AP Rocky's alleged break up after speculation the rapper had cheated.
It was claimed that A$AP had been unfaithful to the pregnant mogul, who is expecting their first child.
The Paris-based shoe designer, who has worked with Rihanna, shut down the rumour in a powerful statement.
Amina set the record straight on the "vile" and "malicious" fake gossip in an Instagram Stories post on Friday.
Her vehement denial comes after the internet was flooded with unfounded stories surrounding the state of mum-to-be Rihanna's relationship with the father of her unborn child, the Mirror reported.
Alleged footage of him cheating with her designer Amina had come to light - according to XXL.
However, the designer told her followers she had to "speak up" and set the record straight on the "vile" fake gossip.
Amina told her 1.2million followers how she initially assumed the fake gossip "would not be taken seriously", but the past 24 hours had seen things escalate.
She continued to explain how Rihanna's pregnancy should be "one of the most beautiful and celebrated times" in her life, and expressed her respect and admiration for the star.
Amina's statement comes after claims Rihanna and ASAP were spotted at a restaurant in LA together, with the singer allegedly spotted crying at the table, before leaving without her boyfriend.
The shoe designer - who Rihanna is often seen wearing - had been dragged into rumours of a split, when many suggested she had been 'the other woman' in the now-debunked affair.
Posted to her Instagram Stories on Friday, Amina's statement in full reads: "I've always believed that an unfounded lie spread on social media doesn't deserve any response or clarification, especially one that is so vile.
"I initially assumed that this fake gossip - fabricated with such malicious intent - would not be taken seriously.
"However, in the last 24h I've been reminded that we live in a society that is so quick to speak on topics regardless of factual basis and that nothing is off limits."
She continues: "Not even during what should be one of the most beautiful and celebrated time's in one's life.
"Therefore I have to speak up as this is not only directed towards me but it is related to people I have a great amount of respect and affection for.
Amina concludes with: "While Rih is continuing to live her serene, best dressed pregnancy life and I go back to my business - I wish everyone a beautiful Easter weekend."
Sources close to Rihanna and A$AP Rocky have also denied the fabricated affair - telling TMZ: "100% false on both counts, 1 million percent not true. They're fine."
Rihanna is expected to become a mother for the first time in a matter of weeks when she gives birth to her and partner A$AP Rocky's first child together.
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