Ma meilleure amie (2005)

Happily married to Antoine, a sports journalist and the mother of two nice kids, Alice is the successful manager of an advertising agency. One day, while driving to work, her path crosses with Michelle, her childhood best friend. The trouble is that when Alice sees her, she is begging in the street. Distraught at this sight, Alice passes her without stopping. But after many hesitations, plagued with a guilty feeling, she decides to host her former friend until she gets back on track. But, in Alice and Antoine's luxury house tension soon rises between Alice and Michelle.