Credit: Chris Jackson/Getty Images

America's sweetheart, meet Britain's sweetheart!

Fellow newlyweds Duchess Kate and Reese Witherspoon became fast friends at a private Sunday event in Santa Barbara, Calif. See more pics of the two exchanging hellos.

Kate, 29, and Witherspoon, 35, shook hands and flashed their world-famous grins as they sipped wine and chatted at the reception, held to mark the launch of the Tusk Trust U.S. Patron's Circle.

While Oscar winner Witherspoon sported an orange dress for the event, the British royal wore a navy and white crochet top and a white pleat skirt, both by Whistles.  (The Duchess looked refreshed and fully recovered from Saturday's star-packed BAFTA bash, where she met other big stars like Nicole Kidman, Barbra Streisand, Jennifer Lopez, Tom Hanks and Jennifer Garner, among others.)

Perhaps the two women compared notes on their recent high profile weddings? Middleton wed Prince William in London on April 29, while Witherspoon and CAA agent Jim Toth tied the knot one month earlier in Ojai, Calif.