The Stefani-Rossdales are still managing to get around, despite Gwen's ever expanding belly.  The preggo mom along with hubby Gavin and baby Kingston met up with tennis pro Roger Federer and his fiancee Mirka Vavrinec at the London Zoo.  The group took in chimps, zebras, your typical zoo fare.  Mirka pushed little Kingston in his stroller for a while, that must have been a nice break for Gwen who is going the double wide version pretty soon!