Lauren Conrad Shopping in LA | Pictures

Lauren Conrad wore her hair in a high bun for a stylish day of shopping in LA on Friday. The outing came just before her big weekend of Halloween fun. On Saturday, she wore a Mary Poppins costume to join her boyfriend, William Tell, at Matthew Morrison's star-studded bash. The good times continued yesterday for Lauren and William, who wore a spooky couple's costume to another party. Lauren and William weren't the only ones getting into the spirit — many celebrities were in Halloween costumes over the weekend! Lauren was home in LA to let loose with William after a busy October spent promoting Lauren Conrad Beauty and Starstruck on a book tour across the country.