Nicole Richie was ready to face the cold in London today when she touched down at Heathrow airport. The mother of two is off on a trip to Europe breaking from work on her new Winter Kate designs, though she'll be in NYC next week to show them off during Fall Fashion Week. Nicole seems happy about her latest adventure, tweeting upon arrival, "London calling! Feels good to be back." She will likely be able to meet up with her husband, Joel Madden, who has been touring Europe with his band, Good Charlotte. He's prepping for a show tonight in Paris, then is heading straight to London.