Seeing red!

Cuban-born, Venezuelan-raised actress Maria Conchita Alonso hasn't held back with former costar Sean Penn -- publicly sparring with the outspoken star for his political views.

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In 2010, the 54-year-old actress wrote an open letter bashing Penn (with whom she costarred in the 1988 film Colors) for his support of socialist Venezuelan president Hugo Chavez. (Penn, 51, praised Chavez for his help in Haiti during an episode of Real Time with Bill Maher. He also met privately with Chavez in Venezuela in 2007.)

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On Sunday, the former costars had a screaming match at LAX Airport. She later revealed in a radio interview to WMAL, "I said, 'You are a communist, Sean Penn.' He said, 'You are a pig!' So I said, 'And you are a communist a**hole! Is it great to live the way you do as a communist?

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Alonso admitted to WMAL she wanted to apologize "for calling Sean Penn an a**hole. He is an intelligent man."

"But if someone calls me a pig, I am not going to turn the other cheek," she said. "But I don't regret calling him a communist.

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