Heidi Montag and Spencer Pratt did their best to smile for the cameras yesterday as they arrived at LAX. They were on their way to NYC to begin promoting their new book, "How to Be Famous," but first up was the requisite kissing and posing for their friends the paparazzi. Unfortunately, their scheduled interview this morning on The Today Show ended up being cancelled — and that set off the latest round of Heidi and Spencer's feud with Al Roker. Spencer took to Twitter today to launch a variety of assaults against the newsman, while Heidi stayed a little more on-message to discuss their book. There's always something up when it comes to Heidi and Spencer, so take a look through their trip to the Big Apple.