"I Am Number Four" star Alex Pettyfer's ex-GF split with him over a risque photo shoot he did with two half-naked models -- but here's the rub ... the shoot occurred MONTHS before they even started dating.
Sources close to the ex-couple tell TMZ, "Glee" star Dianna Agron ended the relationship soon after the pictures were released a couple weeks ago ... in which Alex appears barely clothed with models Lydia Hearst and Leven Rambin.
Problem is -- Alex and Dianna started dating last August ... and he shot the pics over a year ago ... back when he was a single man. Dianna's rep wouldn't comment on the story.
Kids these days.
'Number Four' Star -- GF Was Pissed Over Photo Shoot
2/21/2011 9:00 AM PST BY TMZ STAFF
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