Katie Price's ex Leandro Penna has been arrested following an altercation in the early hours.
The incident is alleged to have happened at the 27-year-old Argentinian model's home.
In a statement, the Metropolitan Police confirmed officers were called to his east London home at 5am on Monday after a man claimed he had been assaulted.
Officers arrived and arrested Penna on suspicion of assault. He is in custody.
The alleged victim did not require medical treatment, Scotland Yard said.
Penna is best known for his relationship with former glamour model Price, which ended earlier this year.
A spokesman for Penna said: "We can confirm that Leandro Penna was arrested in the early hours of this morning near his London home.
"Leo was detained following an apparent altercation with another male at his London home.
"It is our limited understanding that following a gathering at Leandro's home, guests were asked to leave at around 5am. It is then the alleged incident is said to have taken place."