I would suggest testing the waters first. Ask, "Would you be open to answering some questions I have about the business side of the industry, or do you prefer to keep that part of your life separate because I work for you?" Then you're being polite and respectful, making it comfortable for them to answer truthfully. This is a business "request" which means you must be prepared and okay with getting 'no' as an answer.
Should you get a 'yes', have questions prepared incase he/she wants to answer questions right there on the spot.
For more tips and articles by top entertainment industry career coach, The Greenlight Coach, visit www.TheGreenlightCoachBlog.com