Shortly after tying the knot on 31 August the couple headed on a romantic Italian adventure before hopping on a plane again – this time bound for Orlando, Florida.
The Olympic gold medallist posted several photos of herself and Harry, also a swimmer, at the magical theme park - one picture with the caption "Where dreams come true @waltdisneyworld".
Clearly still on a high from her fairytale wedding, which was covered exclusively by HELLO! Magazine, Rebecca donned a pair of sequinned Minnie Mouse ears complete with a bridal veil.
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"Couldn't help myself today," she wrote. "Was a Disney bride!"
While in the US, Rebecca and Harry were joined by their fellow swimming pal Michael Gunning.
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"Sums up our trip," wrote Rebecca alongside a picture of the trio on a rollercoaster. "@harryneeds loving life - @michaelgunning1 scared and me laughing/smiling the whole way through!!! #splashmountain #disney".
Mansfield-born Rebecca married Harry in an idyllic rural wedding venue called The Ashes, set amid 50 acres of Staffordshire countryside.
Having revealed that she lost over two stone before her big day, Rebecca was quick to dismiss the idea that being slimmer was the key to her happiness.
"I'm not suddenly confident because I have lost weight," she said. "I’m happy because I’m marrying the love of my life."
"I compliment her every single day," added Harry. "Because to me she is the most beautiful woman in the world."