Hollywood's brightest stars thank the women who've helped them achieve greatness.

Serena Williams. Emma Watson. Kerry Washington. These women need no introduction.

By every measure, they are talented, strong, and working at the top of their respective fields. But they didn't achieve their success alone.

That's why they've come together, along with some of the biggest names in Hollywood and athletics, to say thank you to the women who got them there.

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How Sheryl Sandberg's take on single moms shifted after her husband died.

A Facebook post from Sheryl Sandberg has gone viral.

Last spring, Sheryl Sandberg's life changed in the blink of an eye.

Her husband, Dave Goldberg, died unexpectedly while the pair were on vacation. The tragedy placed Sandberg, the COO of Facebook and a mother of two, in a role she'd never been in before: single parent.

Sandberg and Goldberg in summer 2014. Photo by Scott Olson/Getty Images.

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