Sadie Frost feels for Sienna Miller

: "My heart goes out to her, I really feel for her.... I feel very sorry that she is so hurt she had to walk out."

Frost, referring to Miller's taking Tuesday night off from her performance in the London production of As You Like It in order to sort things out with Law, spoke to reporters who caught up with her at a party in central London that she attended with new boyfriend Jackson Scott, Britain's Sky News reports.

Law's seven-month engagement to Sienna is up in the air after he admitted an affair in March with Daisy Wright, the nanny of his three children with Frost.