Simon Cowell is "getting serious" with make-up artist Mezhgan Hussainy.
The 50-year-old music mogul was spotted on a date at exclusive London restaurant Mr Chow with the 36-year-old beauty, and the pair are believed to be ready to go public with the romance.
A source said, "Simon is ready to let everyone know. Things between them are moving along very nicely indeed.
"Their relationship has been conducted under a cloak of secrecy but the situation has now changed."
A diner at the eatery added, "It was clear there was real chemistry between them. He seemed smitten and she likewise."
Mezhgan, who was born in Afghanistan before moving to the US in the early 80s, joins a long list of beauties who have dated Simon, including model Terri Seymour and 'So Macho' singer.
The source added, "Simon is clearly very enamored with Mezhgan – and it's little wonder why. She is absolutely stunning, not to mention incredibly intelligent and cultured."