Gwen Stefani spent an afternoon at the Irvine Railroad Park with Kingston and Zuma yesterday. Gwen's dad Dennis joined them for the fun day, which included a train ride, an egg hunt, and a photo op with the Easter Bunny. Gavin Rossdale couldn't join his family since he was busy working on The Bling Ring in LA. He did, however, link up with them earlier this month at a tennis tournament in Indian Wells, CA, where they all cheered on pal Roger Federer. When Gwen isn't spending time with her boys, she's been busy in the studio with her band. No Doubt is currently working on their next album, having recently celebrated their 25th anniversary as a group.