Gwen Stefani gave her mother a hug goodbye yesterday after she and Gavin Rossdale took their son Kingston along to pay her a visit. Gwen was spotted toting a copy of a book about another blond bombshell, Jean Harlow, as she and her guys made their way home. The No Doubt singer was sporting her signature red lipstick during the day out, and Kingston showed off his personal style with some blue toe polish! Gwen got her own nails done a few days ago as she prepped for her busy weekend. She kicked things off with a visit to the park with Kingston and Zuma on Friday and spent Saturday with Gavin at movie producer Brad Grey's wedding, where they joined stars like Brad Pitt, Katie Holmes and Tom Cruise, and Jennifer Lopez and Marc Anthony. Despite her hectic social schedule with friends and family, she's also making time out for a good cause. Gwen and her Harajuku girls are hosting a tea party in LA next month that will help raise funds to rebuild Japan, and she's also auctioning off several items online for the cause.