LOS ANGELES (TheWrap.com) – Henry Hopper, the son of deceased "Easy Rider" star Dennis Hopper, is being sued by a woman who claims that the younger Hopper sexually battered her underage daughter. The suit claims that the 21-year-old Hopper – the product of his father's marriage to his fourth wife, Katherine LaNasa – met the girl, then 15, through a mutual friend in February 2011. The pair continued to communicate via Facebook, the suit says, with Hopper repeatedly inviting the girl to his Venice, Calif. home, and plying her with drugs and alcohol. …