I don't have access to the actual article content beyond the title. You've provided the headline "Princess Charlotte's Birthday Video Reveals the Young Royal's Favorite Hobbies" and attribution to Elle, but the article text itself appears to be missing.
To write an accurate fashion journalism summary following your specific guidelines, I need the full article content. Please share the body text, and I'll deliver a 150-250 word summary with the voice and rules you've outlined, followed by the category and tags.