A new study has found that if you want to decrease the 'mean girl' behaviour in teen girls such as Lindsay Lohan portrayed in the 2004 film of the same name hold an intervention. Relational aggression or 'mean girl' bullying is a popular subject in news and entertainment media. This non-physical form of aggression generally used among adolescent girls includes gossiping rumour spreading exclusion and rejection. As media coverage has illustrated relational aggression can lead to tragic and sometimes fatal outcomes. Now University of Missouri researchers have developed and tested an intervention that effectively decreases relational aggression among teen girls.