Here's what's happening today in pop culture:
• Rapper 2 Chainz was arrested at LAX, accused of stashing pot in his checked baggage. Dude, you know the dogs sniff those bags, right? [Vulture]
• Nigel Lythgoe, founding producer of "American Idol," is leaving the show. [The Hollywood Reporter]
• Time for "Hobbit" fans to lose their cool: It's the first trailer for part 2, "The Desolation of Smaug." [Entertainment Weekly]