The photo has now been removed, but his Twitter post remains: "If you are easily offended, do NOT click here. Oh, Miley! Warning: truly not for the easily offended!"
Perez has happily posted photos of the likes of Paris Hilton and Britney Spears in unfortunate positions on the days they chose not to wear knickers - but we don't know what made him think it was OK to put a minor in the same position.
It is not known whether the photo was doctored in any way. The pic was reportedly lifted from the set of her new video clip, so we doubt she was really going commando.
Miley has recently courted attention for her new 'racy' outfits and onstage antics, including pretending to kiss a girl during a performance on Britain's Got Talent.