Vegging plants started to flower?

A question from a fellow grower:

My plants that are in veg mode started to flower. Whats happenin? How do I stop it from happenin? HELP ME PLEASE

Any chance they are Autos?

We could use a whole lot more info. What type of plants, and as asked by Paulie, are they auto’s?

Are you growing inside or outside and either way, how much light are they getting per day if they are not autos?