Jessica Biel and Cameron Diaz are to be kept apart at the upcoming MTV Movie Awards to prevent a showdown.
Both are presenting awards and Justin Timberlake – Diaz’s ex who is now dating Biel - has been nominated for Best Breakthrough Performance for his movie Alpha Dog.
Organisers are worried the two women could become confrontational if their paths cross.
An insider told the New York Post newspaper: "Everyone is determined to keep Cameron and Jessica far apart. It's becoming a big deal because the girls both want separate arrival times.
"Nobody knows who Cameron is going to bring, if anyone. But if Jessica walks in with Justin, Cameron will want to bring a date. If Jessica goes alone, Cameron will probably walk alone. It's a mess."
Diaz lost her temper at Prince's Golden Globes after-party in January and had a furious row with Justin after she saw him canoodling with Jessica shortly after their split.
The source added: "Cameron is used to being more high-profile than Jessica. But now that Jessica's dating Justin, she has more leverage. Cameron's looking a little unstable lately."
'Charlie's Angels' star Diaz is now dating magician Criss Angel.
