The 31 year old has been suffering with extreme morning sickness since December (12), when she cancelled a number of public engagements after being hospitalised in London for several days.
And now the British royals, who are expecting their first child in July (13), have treated themselves to an island vacation in Mustique with the Duchess' mum and dad, Carole and Michael Middleton.
The party is reportedly staying at a luxury villa, which has an infinity pool, private terrace, game room and a $30,000-a-week (GBP18,750-a-week) price tag.
A source tells The Sun, "The Duke and Duchess have joined the Middletons for a winter break. Both William and Kate were hoping her condition would not stop her from making the eight-hour flight to Barbados and the connection to Mustique. A month ago such a journey would have been unthinkable for her, so this is a clear sign she has made a virtual recovery."