Pink is traditionally associated with girls, while blue is reserved for baby boys.
Kate is seemingly searching for the perfect pink paint as speculation about the sex of the second royal baby goes into overdrive as her due date of end April nears, British media reported.
The pregnant Duchess of Cambridge is said to have also been spotted shopping for pink baby clothes.
High-end Oxford luxury interior design company Annie Sloan has reportedly supplied three paint samples in shades of girly pink to Anmer Hall, the luxurious 10-bedroom house on Queen Elizabeth II's Sandringham which is currently home to William and Kate.
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A little brother for 18-month-old Prince George is less likely at odds of 11-10. Other betting odds have picked Alice as the favourite name for the royal baby if it's a girl.
Kensington Palace has declined to comment on the issue.
A spokesperson for Annie Sloan says the company could not 'confirm or deny that it had supplied paints to Anmer Hall.