Now that Sandra Bullock's cheating ex, Jesse James, is engaged to Kat Von D and getting remarried as early as next month, the actress has the heartbreaking task of preparing her beloved stepdaughter, Sunny, for another mommy in her life.

"Sandra loves Sunny with all her heart and will always be in her life. However, she also knows that [Sunny] will have a new mommy soon and will do whatever she needs to do to make sure Jesse's new wife and Sunny have a great relationship even if that means taking a step away," a friend of the actress tells me.