The Spice Girls singer, her soccer star husband David and their three sons were met by an army of paparazzi and well-wishers.
She says, "It was incredible... We know that people kind of have an idea who we are here in America... but we weren't expecting anything like that.
"Everyone was so kind and saying, 'Welcome to America...' It was a fantastic welcoming. It was really, really great."
And she admits her sons Brooklyn, Romeo and Cruz have already fallen in love with their new home: "The kids actually think they're moving to Disneyland."
Beckham joined her husband as he was officially introduced to fans and media at his new soccer team the L.A. Galaxy's home stadium in Carson, California, on Friday.
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