Caught laughing away and getting high on the day after a paparazzo died trying to snap shots of him, Justin Bieber semi-apologized on Twitter: "Everyday growing and learning. Trying to be better. U get knocked down, u get up," he wrote today. "I see all of u. I hear all of u. I never want to let any of you down. I love u." But in all fairness, the pop icon wasn't in his car when the photog got run down in Los Angeles, Us Weekly reports. See the happy-dope pics on TMZ, which notes that a girl ("NOT Selena") crashed with Bieber at a California hotel.