Mark Ronson and Daisy Lowe Call It Quits

Mark Ronson, who is the brother of Lindsay Lohan's mistress, Samantha Ronson, ends his relationship with model Daisy Lowe.

Representatives from Ronson and Lowe did not comment on why the couple ended it after six months.

Nineteen-year-old Lowe returned to London in which she will be doing fashion shows for the next week.

Lowe was seen with Ronson at a birthday bash to celebrate his 33rd birthday at a country home in Buckinghamshire.

Ronson, who has produced songs for Amy Winehouse and Lily Allen, was seen at a party in London on Sunday night in honor of Winehouse's 25th birthday.

Four years ago, Lowe discovered that her biological father is Gwen Stefani's new husband, Gavin Rossdale, who had brief relations with her mother, Pearl, in 1988.