The couple hosted the cowboy-themed event at their Malibu, California home and made it a memorable day by hiring ponies and encouraging attendees to don fancy dress.
Good Charlotte rocker Madden made an appearance without his girlfriend Nicole Richie, bringing along their four-month-old daughter Harlow.
Beckham arrived with her youngest son, three-year-old Cruz - who was dressed in a monkey costume.
Christina Aguilera and husband Jordan Bratman brought along their 4 month old son, Max, for the birthday bash.
Stefani is expecting her second child.
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Blair Waldorf
Serena Van Der Woodsen
Jenny Humphrey
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