Gwen Stefani & Gavin Rossdale: Zuma's Birthday Celebrations!

Gwen Stefani and Gavin Rossdale step out with their son, Superman-clad Zuma, on his birthday on Thursday (August 21) in London, England.

The 43-year-old rocker and 47-year-old entertainer took their five-year-old little guy out to celebrate!

“london calling” Gavin tweeted over the weekend. “london is blooming.” he added.

PHOTOS: Check out the latest pics of Gwen Stefani

The day before, the whole family, including seven-year-old son Kingston went for a stroll in the Primrose Hill district of London.

10+ pictures inside of Gwen Stefani and Gavin Rossdale heading out to celebrate with Zuma…