The answer to the question is very dependant on demographics. Ask it to men and you'll get a different answer than you will from women. The same thing would apply to age groups or where the respondents happen to live. If you were to ask who the most famous
Canadian is to a group of under 25 year olds right now, they'd probably say Justin Bieber. Ask country music fans and they'll say Shania Twain. Ask it to hockey fans and they'd say Gretzky. Alyssa, it's pretty obvious to me that asking your question to primarily French speaking people will give a huge advantage to Celine Dion over any other person. I'd say that Shatner is a much more well known Quebec born personality world wide than Celine Dion but many people wouldn't say that because they think Shatner is American.
The original series of Star Trek is still seen in syndication world wide, more than 40 years after it went off the air. It's also been re-mastered in high definition for Blu-ray release and is one of the top selling television collections ever released on that format. Shatner returned to television in a number of series, the most recent of which was Boston Legal in the role of Denny Crane for which he won a Golden Globe and Emmy in 2005 and was nominated again in 2006, 2007, 2008, and 2009. He also won an Emmy in 2004 for the same role on The Practice. He's one of very few actors to win an Emmy for playing the same character on two different series.
Shatner also wrote a series of sci-fi novels called TekWar that were adapted for a television series and has co-written a number of books set in the Star Trek universe.
To summarize Celine Dion's career....she sings songs.
Most famous Quebecer, world wide, William Shatner without any doubt.
http://www.youtube.com/watch?v=h1CwZgb_iAI