September 28, 2009 06:00 PM

How Hwee Young/EPA

In hot and humid Singapore for the Formula One Grand Prix, Zuma Nesta Rock Rossdale, 13 months, went shirtless while visiting the paddock with mom Gwen Stefani on Friday.

That night, No Doubt played a show as part of F1 Rocks, a three-day concert event that coincided with the race.

Gwen Tweeted, “Am i awake or am i asleep? jet lag singapore! Just played the set -rehearsal yum-feels good. Can’t think straight but i kinda like it gwenx”

The other Rossdale boys sat this one out — dad Gavin and eldest son Kingston, 3, stayed home in Los Angeles.

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