Sandra Bullock - Bullock Involved In Husband's Messy Custody Battle

SANDRA BULLOCK is embroiled in a custody battle between her husband and his porn star ex.

The Speed actress is standing by her celebrity mechanic husband Jesse James as he fights his second wife Janine Lindemulder's attempts to regain custody of their five-year-old daughter, Sunny.

James has had sole guardianship of the child since Lindemulder, a former adult film star, was jailed for tax evasion. She served six months behind bars and was recently released.

But James is determined not to let his ex gain custody of their daughter, because he fears his little girl would be introduced to a dangerous world if she lived with her mother.

In a statement to the court, James says, "Good cause exists for the court to conduct a review to determine if (Sunny) will be safe with (Lindemulder). She should be restrained from allowing the child around pornographers, drug addicts, guns and firearms, felons and other unsafe environments."

Bullock, who has no biological children, recently admitted she relishes her role as stepmum to James' three kids.

She explained, "I may never hear that word 'mom'. But being a parent is not about breeding. It's about caring.

"When you don't have that title, you flounder and it hurts. But this is the best test of being a parent. And I just have to keep reminding myself I don't care what I get. I care what I give."