In Her Shoes (2006)

Strait-laced Rose breaks off relations with her party girl sister, Maggie, over an indiscretion involving Rose's boyfriend. The chilly atmosphere is broken with the arrival of Ella, the grandmother neither sister knew existed. Flirty, flaky party girl Maggie (Cameron Diaz) and plain, dependable lawyer Rose (Toni Collette) are sisters, best friends and bitter rivals who seem to have nothing in common but size 8 1/2 feet and some family secrets. After a heart-rending falling out, they accidentally discover they also share a long-lost grandmother (Shirley MacLaine). Together they travel a bumpy road toward making peace with each other and themselves.