TMZ caught Will Arnett in a humbling situation with NYC paps -- they didn't know who he was (Who is Zach???). Also in Gotham, a bundled and clammed-up Woody Harrelson, a glum Courteney Cox cracking a wee smile, and Ashlee Simpson debuted her album -- for reals, people -- for the crowd at Marquee (and brought to you by that famous nightlife fuel, Caribou Iced Coffee.)

In LA: Heidi and Spencer getting their necessary pap fix on Robertson Blvd., Gummi Bear discussing his future business ventures and Danny Bonaduce loving TMZ!