James Middleton marked Mother's Day with a special post on Instagram and it quickly sent fans into a meltdown.READ: Kate Middleton's siblings Pippa and James have very different homesTaking to his Instagram, the Duchess of Cambridge's youngest brother shared a beautiful picture of his dogs alongside a vase full of pink flowers and wrote: "Happy Mother's Day to all the mother's (especially my mother), grandmother's, dog mum's and soon to be mother's out there."WATCH: James Middleton reveals cosy Valentine's Day plansThe post had an incredible reaction with fans and was quickly liked over ten thousand times. In the comments, however, many speculated if there was a hidden message behind his words.MORE: James Middleton and Alizée Thevenet's intimate wedding belongs in a fairytale – detailsRELATED: Duchess Kate's brother James Middleton reveals luxury addition to private countryside home"Ahhhhhh is someone having a baby," one follower wondered, whilst a second asked: "Soon to be meaning Alizée?" "That's how I interpreted that's too..." one wrote replying to the speculative comments.