Grumpy Cat's relentless drive to conquer the world continues - with the frowning feline now usurping baby Prince George.

Not content with helming a movie and a book, the caustic cat - named Tardar Sauce - has now been superimposed into the arms of proud parents the Duke and Duchess of Cambridge.

H/t to Theories of the Deep Understanding of Things for posting this gem up on Facebook.

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  • Grumpy Cat does not look impressed at her book signing in Los Angeles. (Credit: AKM-GSI)

  • Grumpy Cat does not look impressed at her book signing in Los Angeles. (Credit: AKM-GSI)

  • Grumpy Cat does not look impressed at her book signing in Los Angeles. (Credit: AKM-GSI)

  • Grumpy Cat does not look impressed at her book signing in Los Angeles. (Credit: AKM-GSI)

  • Grumpy Cat does not look impressed at her book signing in Los Angeles. (Credit: AKM-GSI)

  • Grumpy Cat does not look impressed at her book signing in Los Angeles. (Credit: AKM-GSI)

  • Grumpy Cat does not look impressed at her book signing in Los Angeles. (Credit: AKM-GSI)