Former "Glee" actress Dianna Agron wasn't invited to appear in the show's Cory Monteith tribute episode because actress Lea Michele and show co-creator don't like her, according to RadarOnline.com.

How strange -- people in Hollywood being petty to each other while having no regard for their fan base.

The website reported a high-level source from the hit Fox show said other cast members not contracted for the current season -- like Agron -- came back for the tribute episode.

"It's shocking, because even though she's not contracted for this season, many other actors returned to pay tribute to Cory ... even ones with less of a story connection to Finn than Dianna had," the source said. "Remember, she played his girlfriend on the series, and was a major part of his storyline."

Dianna Agron attends the Miu Miu show as part of the Paris Fashion Week Womenswear Spring/Summer 2014 at Palais d’Iena on October 2, 2013 in Paris,
Dianna Agron attends the Miu Miu show as part of the Paris Fashion Week Womenswear Spring/Summer 2014 at Palais d'Iena on October 2, 2013 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)

Unfortunately for Agron, Lea Michele played his girlfriend not only on the show, but in real life.

The insider reportedly said Michele and Murphy "intensely dislike Dianna and have both worked to marginalize her as much as possible. They never saw her as a team player. They simply did not want her sharing the glory for this very special episode."

Is it really "glory" we're talking about?

Monteith was found dead July 13 in his Vancouver hotel room. The coroner's report said he died from an overdose of heroin and alcohol. He was 31.

Radar's calls to Agron's rep went unreturned.

Contact Tony Hicks at Facebook.com/BayAreaNewsGroup.TonyHicks or Twitter.com/insertfoot.