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X17online can report EXCLUSIVELY, that just an hour ago, Gwen Stefani passed out during an outdoor carnival at her son Kingston's school. An ambulance was called and EMT's check out Stefani before advising her to go home and rest, according to a security guard at the event.

Stefani's assistant drove her and the children home just after and it doesn't appear the singer sought any further medical treatment.

UPDATE - MORE sources from the school are now telling us Gwen was NOT treated by the EMT ... the ambulance was called for another guest at the event.

News spread through the carnival that Stefani had collapsed but we've confirmed now that our original source was wrong -- Gwen's just fine! In fact, we spotted her grocery shopping just and hour and a half after the ambulance arrived at the school!