Kate Moss "Beside Herself" Following Rhys Ifans and Sienna Miller Split

British supermodel Kate Moss is said to be "beside herself" following her pal Rhys Ifans' split from Sienna Miller.

The catwalk queen -- who has had a turbulent friendship with Sienna -- has been rallying around Rhys since the break-up earlier this month, and is doing everything she can to cheer him up.

A source reveals, "Kate seemed beside herself. Rhys spent a few nights with her just after the break-up but he seemed to be in denial. He kept saying he could fix it.

"Kate said she knew exactly what he was going through because she it was similar to when she split from Pete Doherty last year. Kate made a real effort with Sienna for Rhys' sake and she is upset to see him so devastated."

Meanwhile, 'The Edge of Love' actress Sienna is getting support from some unlikely sources -- including her ex-boyfriend Jude Law.

An insider said, "Jude called Sienna and said she shouldn't worry about what everyone was saying. He told her to focus on how well things were going in Los Angeles, adding that only she and Rhys really knew what happened."