Kate Hudson wearing her Alexandre Birman $495. colorful ballerina flats, and son Ryder land at London’s Heathrow Airport a few days ago. The fancy flats which are favorites of Hollywood ladies including Anne Hathaway, Courteney Cox, Blake Lively, Demi Moore and Diane Kruger come in a variety of colors and are sold at Saks, Neiman, Bergdorf  and Net-a-Porter.