One source claims the 18-year-old was actually bullied for being there -- apparently not everyone thought she earned the right to walk the shows!
The insider spilled:
When we saw Gwen Stefani at the amfAR Cinema Against AIDS Gala in Cannes on Thursday night we were blown away at how stunning she looked.
The designer's dress du jour is a custom L.A.M.B. mermaid gown and she struck the sickest pose for the photogs.
Fantastic choice, Gwen!
[Image via Getty Images.]