Benji Madden helped Joel get Harlow and Sparrow through LAX this morning. The siblings and Good Charlotte bandmates headed out of town to kick off their US tour, and it looks like Joel's adorable kids are going along for the trip. Their first concert is in Atlanta tomorrow, but we'll have to wait and see if Nicole Richie joins them for their other stops around the country. She's been sticking to her fitness routine in LA and was spotted leaving the gym again yesterday. Nicole and Joel did fit in some couple's time before he hit the road, though, as they stepped out Sunday for Elton John's Oscars bash.