Teen high school movie Mean Girls knocked Denzel Washington's thriller Man on Fire off the top of the US box office chart.
Mean Girls stars 17-year-old Lindsay Lohan (l)
The movie, starring Lindsay Lohan, took $25m (£14m) in its first weekend, already surpassing its modest production budget.
Man on Fire slipped down to two, taking $15m (£8.4m) in its second week.
Pierce Brosnan and Julianne Moore's romantic comedy Laws of Attraction made its debut at number four.
Sci-fi thriller Godsend, starring Greg Kinnear, Robert De Niro Rebecca Romijn-Stamos, entered at number five with $7m (£3.9m).
Ben Stiller's latest comedy Envy, which also stars Jack Black, followed closely at number six with $6.9m (£3.8m)
Next weekend marks the beginning of the studios rolling out their summer blockbusters, with monster-hunting tale Van Helsing opening on Friday.
This will be followed by the much-anticipated Brad Pitt epic Troy.
Star of Mean Girls, Lohan, 17, is one of the latest crop of young actresses making her name in teen movies, alongside Hilary Duff and Amanda Bynes.
Lohan has previously appeared in Confessions of a Teenage Drama Queen, Freaky Friday and Parent Trap.