
Orlando Bloom's admitting he and Katy Perry have a tough time keeping the romance going in their relationship -- but it definitely isn't for lack of physical beauty, which is crystal clear in some new photos.

Orlando's leaving very little to the imagination ... showing off his abs and more, appropriately, for the new issue of Flaunt. Once you get past the images -- if you can -- he also spoke to the magazine about his fiancée Katy.
Far from gushing about their relationship, Orlando said, "Sometimes things are really, really, really, challenging. I won’t lie. We definitely battle with our emotions and creativity."
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