Nicole Richie and Joel Madden hosted a lavish New Year's bash in Vegas, but over the weekend it was back to their regular schedule. Fresh off a 5 a.m. return to LA, January 1 required some caffeine for Nicole before fitting in a New Year's Day hike. Saturday they grabbed lunch at the 8 oz. Burger Bar. Joel twittered about returning to the studio on Sunday, and Nicole had her own life updates — including a celebrity sighting of Monica Lewinsky. Yesterday, the Richie-Maddens were spotted heading into Cash Warren and Jessica Alba's house for a playdate. Nicole and Joel's family is one of your favorites for 2009 and they're already off to a sweet start this decade.