Gwen Stefani Shopping With Zuma

Gwen Stefani took Zuma shopping for party decorations in LA yesterday. Zuma, who turned 4 on Monday, wore a superhero costume and it looks like they picked up similarly themed items during the outing, including oversize Spider-Man and Batman figures. They may be prepping for a weekend birthday bash, which would be just another fun addition to their exciting Summer. The Stefani-Rossdale family already vacationed in Florida, played in the sand in Newport Beach, and shared a park day in NYC.

There was also business mixed in, though, since Gwen performed with No Doubt during their East Coast visit. Gwen recently shared that getting back together with the band has been a "nice break" from her duties as a mom. There will be even more work in store for the group before their new album, Push and Shove, drops on Sept. 25, including a concert during the iHeartRadio Music Festival in Las Vegas.