The Rules of Engagement actor, 38, uploaded the nude snap on Sunday (18Jan15) and captioned it, "No place like home... #notanlines (sic)".
The image features Hudson looking out over some mountains with his tanned back to the camera, clearly displaying his pale skin from the waist down.
However, his younger sister, movie star Kate Hudson, was not impressed with the revealing picture and posted a comment beside the shot, writing, "Is this really necessary?"
Fans of Oliver shouldn't be surprised by the naughty photo - he joined Instagram earlier this month (Jan15) and warned followers what to expect.
Alongside his first 'selfie', he wrote, "I want to invite you all to experience the real Oliver...No filters no inhibitions...Just me both figuratively and literally...butt naked...Cheers!!"
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