Celebrity Baby Sighting: Zuma!

While son Kingston feels up Ruby Maguire, Gwen Stefani is showing off two-month old Zuma to the world.

The pair visited a library in Beverly Hills yesterday.

Zuma's dad, rocker Gavin Rossdale, describes the baby as "amazing" and "very sweet," adding:

"He hangs out. He's got his neck together. He's gone through with the floppy stage."