Steve Tisch, Billionaire Baller?Newly divorced billionaire and New York Giants co-owner Steve Tisch might be dating women on both coasts. Martha Stewart created a special Christmas tree for Sirius Radio’s office, complete with Howard Stern cookie ornaments. Former NYSE head Dick Grasso left CNBC’s Charles Gasparino a creepy “merry Christmas” message on his answering machine, despite the fact that Gasparino’s new book takes Grasso to task for the $190 million kiss-off he took after leaving the Exchange. John Mayer has had a crush on Ricki Lake for two years (Ed. note: WTF?!), and actually got her digits at the wonderfully successful Sunshine Sachs Christmas party. Lance Armstrong picked up the tab for dinner with former flame Sheryl Crow. Jorge Posada and Mariano Rivera hung out together at the Sports Illustrated Sportsman of the Year party. Andy Samberg, Amy Poehler, and Seth Meyers had lunch together.