Despite widespread rumors online, Simon Cowell is not walking down the aisle with American Idol makeup artist Mezhgan Hussainy, has learned exclusively.

Cowell's longtime publicist and close friend Max Clifford tells "I spoke to Simon in London yesterday afternoon, just before he took his flight back to LA," Clifford explains. "I asked him: 'Look, are you engaged? Is it true?,' and he said, 'No! No. I'm not engaged.'"

Cowell brought Hussainy, 36, as his date to his 50th birthday party last October -- just six weeks after splitting from girlfriend of six years Terri Seymour, according to British reports.

Hussainy provoked speculation when she wore a new diamond ring while dining with Cowell Sunday night at Mr. Chow's in London.

Check out funny old pics of Simon and other American Idol judges

And during a British TV appearance on Tuesday, Cowell gushed of Hussainy: "She's the one...She's very special." The sharp-tongued judge even noted his desire to become a father: "I think I need to have little Simons around."

Born in Afghanistan, Hussainy was mostly raised in Hollywood. She joined American Idol during its second season as the make-up artist to judges Cowell, Paula Abdul and Randy Jackson.

"Yes, they are they an item," pal Clifford tells Us. "Yes, they're happy. But they're not engaged. That's straight from Simon's mouth."