Hayden Keeps Photogs Off Pot

8/16/2007 10:15 AM PDT

Hayden Keeps Photogs Off Pot

Hayden Panettiere fulfilled her heroic duties yesterday by warning a photographer about the dangers of pot.

TMZ cameras were on Robertson Blvd as the jailbait and her hot mom did some shopping for a dress to wear for an appearance on Letterman. As the paps walked backwards, throwing questions her way, Hayden suddenly started yelling "Pot! Pot!" and pointed ahead. No, there wasn't any Mary Jane on the sidewalk, but a planting pot holding some threatening bushes -- that one photog was dangerously close to toppling over.

Having saved the day, Hayden then flew away ... in her Porsche Cayenne.