Conrad Hilton, the younger brother of Paris Hilton, has been arrested at his ex-girlfriend's Hollywood Hills home on suspicion of violating a restraining order.
The woman called police yesterday afternoon to say Conrad Hilton was trying to gain access to her property.
The 21-year-old was taken into custody without incident. He was later released on $5,000 (€4,400) bail.
Hilton was under a court order preventing him from contacting his ex-girlfriend or members of her family, police said.