Joel & Nicole Rock On!

As OK! previously reported, Nicole Richie and a 4-month-old daughter Harlow joined Joel Madden for a few stops on his current tour. The Good Charlotte singer, 29, hasn't gotten to spend much quality time with his little girl, but a pal of his tells OK!, "He missed Nicole and Harlow, so a weekend with them was exactly what he needed."

Joel even took to calling Harlow "his little rock princess," and Nicole, 26, is helping her dress the part: The Simple Life star recently picked up matching mommy-and-me zebra-print hoodies from Primp to keep Harlow warm on airplane rides to see her daddy!