Jackson Lee/Splash News Online
No Doubt frontwoman
Gwen Stefani and her sons -
Kingston James McGregor, 3 (not pictured), and
zuma Nesta Rock, 1 - stopped by the
Children's Museum of Manhattan on Sunday, where they took a drop-in class.
Later in the day, Gwen joined husband
Gavin Rossdale out in Queens, where
they watched pal
Roger Federer's semi-final match against
Novak Djokovic.
The couple were back in the