Gwen Stefani and Gavin Rossdale met up with Heidi Klum and Seal in Manhattan on Labor Day and enjoyed a nice stroll around the city with the kids. I see lots of possible joint ventures disguised as 'playdates' for the kids here. Klum modelling for Stefani's L.A.M.B. clothing line (possibly inviting Gwen to the Project Runway set?) and Seal and Rossdale collaborating on an album.