Instead of going to a spa or a Hollywood club, Fergie spent her 36th birthday this weekend running in the rain with hubby Josh Duhamel and thousands of others to raise money for the Japan tsunami relief fund, and RadarOnline.com has exclusive interviews with the charitable celeb couple.

PHOTOS: Josh & Fergie Raise Money For Japan

Despite the nasty weather, 4,000 supporters, including Paris and Nicky Hilton, joined Fergie and Josh at the Josh Duhamel tokidoki Youth Relief Run for the American Red Cross on Sunday at the Santa Monica Beach to raise $140,000 for the victims in Japan.