by POPSUGAR Moms 5

If you're a stylish mommy looking to surprise your sweetheart this Valentine's Day, there's one gown that will make his jaw drop.

The stunning green dress Keira Knightley wore as Cecilia Tallis in Atonement is being auctioned off to benefit children. And, the bidding has begun!

As of today, you can place your bid at the Foundation’s website.

Variety International – The Children’s Charity has raised over $1.5 billion to help children in 14 countries since it was founded in 1927. The Southern California chapter which started fourteen years later has been considered the “Heart of Show Business” because of the support it receives from Hollywood.

Photo courtesy of Focus Features