Sandra Bullock has contacted family lawyers to fight for custody of her stepdaughter, reports.

The actress — whose husband Jesse James allegedly cheated on her with tattoo model Michelle “Bombshell” McGee — has reportedly contacted legal representatives and has been devastated to find James’ infidelity will not affect her chances of getting custody of stepdaughter Sunny.

A U.S. legal source said: “Infidelity has no bearing on custody. The most she can aim for right now is split custody, and a lot of that would have to be agreed by him.”

A source close to the star added: “Sandra is beside herself with worry. She thought she had the perfect marriage.

“Now she feels that she’s at risk of losing everything. Sunny means the world to her. She loves that girl to death.”

The actress has raised Sunny — James’ daughter from his former marriage to porn star Janine Lindemulder — as her own, but is now terrified the child’s mother will use this opportunity to try and get back the visitation rights which she lost earlier this year after being jailed for tax evasion.