Gwen Stefani ran errands with Kingston by her side in London today. It's Gwen's 42nd birthday and the No Doubt frontwoman, who was accompanied by her son and a friend, flashed a smile as she made her way back to their flat. Later, an oversized delivery of flowers was dropped off at the house. The lavish bouquet may have been from her husband, Gavin Rossdale, who unfortunately couldn't be with Gwen to mark the special occasion. He's been busy touring with his band, Bush, and the quartet is playing a show in Saint Paul, MN, tonight. Gwen, Kingston, Gavin, and Zuma Rossdale have been spending time at their place in England lately, with plenty of trips back and forth to LA, where Gwen has been working on No Doubt's reunion album. The Stefani-Rossdales recently met up with another American family in England, the Jolie-Pitts. Angelina Jolie and Gwen's kids had a playdate last week, during which the little ones got messy playing with paint.