But Wills and his wife tried to spread a little cheer, with a gorgeous family snap, some sentimental throwback pics, and a peek into Prince George's artistic talents!
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'To mothers new and old and families spending today together and apart – we are thinking of you all at this difficult time,' the couple wrote on their Kensington Royal Instagram page.
They also wished their followers a, 'Happy Mother’s Day.'
They also gave fans a little explanation of each of the four photographs they shared - and the last one was just gorgeous.
'1. The Duke and Duchess of Cambridge with their children in Norfolk,' was the first image.
The second is of, 'Diana, Princess of Wales, with her children Prince William and Prince Harry.'
The third is a gorgeous throwback of, 'Carole Middleton with her daughter Catherine.'
And finally, 'A card from Prince George to his mother this Mother’s Day.'