Is my friend rude to have done this?

If Jess is your best friend, you should be able to talk to her. Tell her how you feel and that you are truly hurt. What is she doing with the other 2 tickets (if she won 4 tickets??) Anyway, if she takes Jackie, plan something else that night - and have a great time. Show Jess that life goes on whether she's your friend or not. Good Luck