Speaking to The Sun, the 20-year-old actress disclosed that her other male co-star Rupert Grint is quieter.
She said: "Dan and Rupert have been there for me - but they are very different people. I can have a real gossip with Dan about everything while Rupert is quieter."
Watson has now finished filming for the franchise, but will be attending the premiere for Harry Potter And The Deathly Hallows next week.
Of her future, the star teased: "I want to keep acting. I love singing and so would love to do a musical. I want to travel and become fluent in French. I'm a pretty positive person. My phone is full of quotes that I love - like, 'Live every day to the full'."