The 47-year-old guitarist has entered an undisclosed rehab facility to treat a currently unknown substance abuse problem.
A statement released to website People.com reads, "Richie Sambora has entered an undisclosed treatment facility in Los Angeles. He asks that you respect he and his family's privacy at this time."
Sambora's divorce from actress Heather Locklear was finalised in April (07) and he split from girlfriend Denise Richards earlier this year (07).
[Source]
