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The rapper was spotted with Diaz at a book launch for pop singer Prince on Friday evening. Other guests at the bash included Sly Stallone, Babyface and Eddie Murphy.
According to New York's Daily News, the couple spent the evening laughing and holding hands, while Diaz apparently spoon fed the musician her bread pudding.
Later in the night the duo were apparently heard "giggling" behind a locked door in Prince's Beverly Hills mansion.
"Diddy was bringing his lips towards hers when he realised someone was approaching," said a source. "Smiling, they closed the theatre's door and locked it."
