How does a couple fend engagement rumors one week and announce their split the next? Such is the question fans have about Dianna Agron and Alex Pettyfer.

But TMZ now claims to have the answer: a source tells that website the Glee actress was steamed over a racy Tyler Shields photo shoot involving Pettyfer, Lydia Hearst and Leven Rambin. The only problem with this break-up basis?

While the pictures were released a couple weeks ago, Pettyfer posed for them months before he even started dating Agron. Still, they are pretty darn hot.

Might he have kept news of their existence from Agron,

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