Friends claim Timberlake left a personal message for his ex-girlfriend after calling the Promises treatment center in Malibu, California, last week.

A pal tells Life & Style magazine, "He wished her the best and told her to get healthy and come back as the Britney he knew."

And Timberlake has asked Spears' mother Lynn to keep him updated with the “Toxic” singer's progress.

Pink and Mary J. Blige have also called Promises to leave messages for Spears, who under the center's rules, isn't allowed to receive phone calls during her stay.