Naomi Campbell had an awkward run-in with her ex-boyfriend Vladimir Doronin.

The supermodel and the Russian billionaire - who split in May after five years of dating - showed up at the same Interview magazine party at soon-to-open restaurant Monarch in New York City on Tuesday night (10.09.13), leading Vladimir to make a swift exit.

The brunette beauty arrived at the bash at 12:45am and was seated at a VIP table just metres away from her ex.

A source told the New York Post newspaper: ''Only a security guard separated them.''

Another eye-witness to the scene added: ''She went in, and he came right out.''

Interview magazine's lavish new issue celebration party was attended by a host of stars including Leonardo Dicaprio, A$AP Rocky, Doutzen Kroes, Jourdan Dunn and Chanel Iman.

Naomi, 43, and Vladimir are rumoured to have fallen out over his alleged liaison with her model protégé, Zi Lin, who was a finalist on her reality TV show 'The Face'.

The former Miss Universe China was spotted smooching the Russian tycoon during a romantic break on the Spanish party island of Ibiza shortly after things ended with Naomi.

Neal Hamil, President of MIX Model Management NYC, said at the time: ''Zi Lin's contract with MIX Model Management NYC was terminated last week due to ongoing unprofessional conduct and unacceptable work ethic.''