Naomi Campbell's boyfriend Vladislav Doronin's obsession with celebrities reportedly led to their split.

The couple are thought to have temporarily separated after five years of dating and friends believe it is due to the 50-year-old Russian billionaire's love of partying with his celebrity friends.

A source told the New York Post's Page Six: ''He is too swept up in the celebrity lifestyle

''In many ways their relationship is like a business arrangement. Naomi brings style to his hotels and properties, and he treats her extremely well. But they spend a lot of time apart due to work commitments.

''Naomi and Vlad have broken up, and he's been out partying in New York.''

However, other friends have claimed the couple have an on/off relationship so this may not be the end for them.

Another source added: ''Naomi and Vlad have a complex relationship, and sometimes break up and make up ... They spend a lot of time apart due to work commitments.''

Naomi, 42, has had numerous work commitments over the past few months with her TV show 'The Face' proving to be a huge hit in the US. She also has a UK version now taping which has kept her apart from the hotel and property mogul.

Despite their separation, the model is expected to invite Vladimir, 50, to her 43rd birthday party on May 22 in Ibiza.