I found a clip of Lindsay Lohan from the bloopers of Herbie: Fully Loaded I don't know if she's actually getting tickled, but it sure looks like it! There's two clips. One is around 4:39, and the other is 4:52.
http://www.youtube.com/watch?v=pwdFHo6J4i8
http://www.youtube.com/watch?v=pwdFHo6J4i8