The No Doubt singer - who has sons Kingston, four, and two-year-old Zuma with husband Gavin Rossdale - has given the huge sum to Save the Children's Japan Earthquake-Tsunami Children in Emergency Fund to help with recovery in the disaster-stricken nation.
She said in a statement: "I've been inspired by Japan for many years and have a true love, appreciation and respect for the Japanese people and their culture.
"The disaster in Japan is beyond heartbreaking, and I want to do anything I can to help. I would never be able to make a gesture like this without the love and support of all the fans over all these years."
In addition to her donation, Gwen will unveil a limited edition Harajuku Lovers T-shirt on her band's website, with all proceeds from sales of the garment also going to help with relief efforts.
Gwen is not the only celebrity to donate a portion of their wealth to the cause.
Both Demi Lovato and Sandra Bullock have also given $1 million to the cause, while Clint Eastwood and Warner Bros. announced profits from the sales of 'Hereafter' on DVD would be donated to help the country.
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