Kristin Bell sporting the Guess Invisible Children T-shirt at last night's event in Beverly Hills. I’ve got to admit, Kristin Bell impressed me last night. I had heard of her involvement with the nonprofit organization Invisible Children but had looming doubt that she—or any of the other celebrities lending their name to the cause—truly understood the politics behind the 24-year-long war in northern Uganda and the urgent need to end the rule of the Lord Resistance Army’s rebel leader, Joes