Nicole Richie and Joel Madden arrived in LA after a flight from Australia yesterday. Joel and Nicole carried their kids, Harlow and Sparrow, through the terminal alongside Nicole's dad, Lionel. The Richie-Maddens spent most of the month Down Under, where Joel was working as a mentor on the Australian version of The Voice. Over the weekend, Harlow and Sparrow were treated to a performance by their dad and grandfather, who sang together on stage during an episode of the TV talent show. Nicole, Joel, and the kids made the most of their time in Australia, taking trips to the Sydney Zoo and celebrating Father's Day together as a family. Joel seems to have grown fond of Oz, tweeting today, "Australia, I will miss you."