This is the one beauty product Kate Middleton is not allowed use

Have you ever notice this?

Among other things, Kate Middleton is known for her beautiful sense of style and how perfect she looks at every event she attends. No matter what she wears she still manages to look impeccable. Even her hair and makeup is always on point. But, of all the decisions she makes regarding her clothes and appearance, there is one that she can't change. Apparently, she's not allowed to wear any nail polish. We've scanned back through a lot of photos and she has never appeared at an event with nail polish on her nails. According to The Mirror, the royal family are prohibited from wearing nail polish as it is deemed as 'vulgar' and not in keeping with 'royal etiquette'. Now, we know that Queen Elizabeth is fond of a bit of light pink nail polish but that's about the extent of it. If it's not close to nude then it's not allowed. We wonder will Meghan Markle start to follow suit as she prepares to join the royal family?