What In The?!? Henry Hopper, Dennis Hooper's Son, Accused Of Raping 15-Year-Old! (DETAILS)

Henry Hopper, 21, the son of legendary Hollywood actor Dennis Hopper, has been accused of raping a 15-year-old girl after seducing her with drugs and alcohol.

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As reported by TMZ:

Henry Hopper -- who starred in Gus Van Zant's "Restless" in 2011 -- is being sued by the mother of an unidentified 16-year-old girl ... who claims the girl met Hopper through a mutual friend in Feb. 2011.

According to the legal papers, the girl -- identified in the lawsuit as Jan Doe -- claims the two began to communicate on Facebook ... and in the months that followed, Hopper invited her to his home in Venice, CA on multiple occasions with the promise of drugs and alcohol.

In the suit, Doe claims Hopper would wait until she was intoxicated ... and "engaged in sexually offensive conduct with her" ... including sexual intercourse, forced oral copulation and sodomy.

Doe's mother claims the girl had to seek mental health after the alleged attack.

SOURCE: TMZ