VIDEO: Gwyneth Paltrow Drops The 'C-Word' On Chelsea Lately

April 26 2011, Published 9:50 a.m. ET

Normally prim and proper Gwyneth Paltrow surprisingly dropped the C-word on Monday's Chelsea Lately, where she appeared to promote her new cookbook, My Father's Daughter.

The discussion turned to family -- and eventually grandmothers -- when they realized both of their grandmothers shared the name "Mutti.”

Host Chelsea Handler said her grandmother was "a real b****," then Gwyneth one-upped her, saying "My Mutti was a real c***."

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The audience cheered loud, knowing they had just seen --and heard -- something unusual from the Glee guest star.

"She just hated my guts, basically, and she tried to poison my mother against me," Gwyneth said. "She must not have been very happy and she must have had a lot of pain, because she was as mean as hell."

Watch the video on RadarOnline