The celebration of Black Panther's seven Oscar nominations — including one for Best Picture — continues, and now the movie's star Chadwick Boseman is expressing gratitude for the film's historic achievement.Boseman posted a message to Twitter that starts by acknowledging, "We just made history." He went on to write, "What an incredible honor. Thank you to @TheAcademy and congratulations to my entire @theblackpanther family!" Boseman also included an image of himself as the movie's titular character morphing into the cover for Entertainment Weekly's Oscar issue, which features Black Panther's mask with a bow tie.RELATED: Kirby Family Releases First Black Panther Sketch to Celebrate Oscar Nom

Black Panther is the first superhero movie to earn an Academy Award nomination for Best Picture. The Academy's decision to expand the Best Picture field to include up to 10 nominees is believed to be based on The Dark Knight's failure to earn a nomination a decade ago. In the time since, however, no superhero film has managed to crack the category until now.

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In addition to Best Picture, Black Panther also scored nominations for Original Score, Original Song, Sound Mixing, Sound Editing, Costume Design, and Production Design.

The winners of the 91st annual Academy Awards will be presented Sunday, February 24, in a ceremony broadcast live on ABC.