Nicole Richie's daughter has celebrated her fourth birthday with a 'Toy Story'-themed party.

The fashion designer - whose House of Harlow 1960 clothes collection is named after her little one - and husband Joel Madden celebrated Harlow's latest milestone at Studio City, California with a number of celebrity guests.

Ashlee Simpson and Pete Wentz's divorce has been finalized.

According to legal documents filed in the Los Angeles Superior Court, the couple - who split in February after three and a half years of marriage - formally ended their union on November 22.

Jessica and Ashlee Simpson's mother came up with the idea for their clothing line.

The girls' mother, Tina, was the first person to suggest they combine their two individual styles in a clothing line aimed at young girls.

Jessica and Ashlee Simpson launched their girls' clothing line yesterday (01.12.11).

The sisters - along with Jessica's fiance Eric Johnson and Ashlee's three-year-old son Bronx - mingled with the young guests at Dylan's Candy Bar as the T-shirts, shoes and jeans went on sale for the first time.