Gwen Stefani celebrated her 39th birthday with a star-studded bash held at her Hollywood Hills home on Friday (03Oct08). The singer danced all night at the outdoor event hosted by husband Gavin Rossdale with celebrity couples including Ashton Kutcher and Demi Moore, Ellen Degeneres and PORTIA De ROSSI, Nicole Richie and Joel Madden and her own No Doubt bandmates.