Jack Black has bared his 'man breasts' for charity - the actor underwent a mammogram scan to publicise the new Men for Women Now campaign.
The actor has filmed a short online video to promote the drive by the Noreen Fraser Foundation (NFF), which urges men to support the women in their lives with a pledge that involves healthy eating, regular exercise, self breast exams and scheduling appointments for a mammogram.
Black is seen stripping off and hooking himself up to a scanning machine, which helps detect the early signs of breast cancer.
Speaking into the camera he says, "All us guys, dudes and bromigos are getting off our lazy butts and making appointments for our beloved ladies to meet with this bad boy - the mammogram machine - or, as I like to call her, the boob saver."
Kevin Connolly, comedian Bob Saget and The Hangover star Zach Galifianakis have also joined the campaign, writing and starring in their own web videos.