How to Lose a Guy in 10 Days (2003)

One of them is lying. So is the other.

It's the battle of wills, as Andie needs to prove she can dump a guy in 10 days, whereas Ben needs to prove he can win a girl in 10 days. Now, the clock is ticking—and the wildly entertaining comedy smash is off and running in this irresistible tale of sex, lies and outrageous romantic fireworks!