Lena Dunham Goes on Twitter 'Rage Spiral' After Being Accused of Molesting Her Sister

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Lena Dunham lashes at out those claiming that excerpts from her book, Not That Kind of Girl, imply that she abused her younger sister, Grace Dunham.

One of the excerpts that prompted these allegations reads:

"One day, as I sat in our driveway in Long Island playing with blocks and buckets, my curiosity got the best of me. Grace was sitting up, babbling and smiling, and I leaned down between her legs and carefully spread open her vagina. She didn't resist and when I saw what was inside I shrieked."

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"My mother came running. 'Mama, Mama! Grace has something in there!'"

"My mother didn't bother asking why I had opened Grace's vagina. This was within the spectrum of things I did. She just went on her knees and looked for herself. It quickly became apparent that Grace had stuffed six or seven pebbles in there. My mother removed them patiently while Grace cackled, thrilled that her prank had been a success."

At another point in the book, the Girls star recalls bribing her sister with "three pieces of candy" if she could "kiss her on the lips for five seconds." She also admits to masturbating while sleeping in the same bed as her sister.

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Conservative-leaning magazine National Review and the blog Truth Revolt both call out these excerpts from the book as being an indicator that Dunham sexually abused her sister.

Dunham, 28, took to Twitter on Saturday to defend herself against such claims.

"The right wing news story that I molested my little sister isn't just LOL -- it's really f**king upsetting and disgusting," she wrote. "Usually this is stuff I can ignore but don't demean sufferers, don't twist words."

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"I told a story about being a weird seven year old. I bet you have some too…"

As for how her sister is reacting, Dunham wrote: "I wish my sister wasn't laughing so hard."

 Grace, 22, acted in her sister's film Tiny Furniture and played her on-screen sibling.

Since her "rage spiral," Dunham has canceled two of her European book tour dates, one at the Antwerp Book Fair in Belgium and another in Berlin, Germany.

The Golden Globe winner recently spoke to ET about her book and her friendship with Taylor Swift. Check out our in-depth interview, below: