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The former swimming champion also shared a loved-up selfie with boyfriend Andrew as they celebrated his birthday with the low-key break.
In the caption, Rebecca, who is around 28 weeks pregnant, gushed it was the first she'd felt 'truly relaxed in months.'
Cosy: The former Olympic gold medallist took to Instagram to share a trio of snaps from the babymoon to celebrate her boyfriend Andrew Parsons' birthday
Lavish: Among the snaps were an image of the gifts laid out in the hotel room for Rebecca and her boyfriend Andrew
She wrote: 'What a lovely weekend! Had the best time celebrating @andrewparsons5 birthday and enjoying our little baby moon.