AceShowbiz - Hopper Penn, 24-year-old son of Sean Penn and Robin Wright, was busted on Wednesday afternoon, April 4 in Nebraska for possession of marijuana and mushrooms. The drug-addict son of the stars is currently detained at a Hamilton County, Nebraska, jail.

A rep for the Nebraska State Patrol said that Hopper was arrested "at approximately 3.54 P.M." The rep continued, "A Nebraska State Patrol trooper stopped a vehicle at the Giltner exit on Interstate 80 for failure to signal. The vehicle was a 1992 Volvo traveling westbound." Hopper and his actress girlfriend Uma Von Wittkamp (26) were on the vehicle.

"During the traffic stop, the trooper detected drug activity and searched the vehicle. Troopers found 14g of marijuana, 4 amphetamine pills, and 3g of psilocybin mushrooms," the rep shared.

Uma was arrested for possession of controlled substance (amphetamine) and possession of a controlled substance (psilocybin). Meanwhile, Hopper was arrested on charges of possession of a controlled substance (psilocybin) and possession of marijuana (one ounce or less). A jail spokesperson revealed to Radar Online that the bail for Hopper is set at $25,000.

Following the arrest, Sean was allegedly furious. A family insider told Radar Online that the actor "doesn't even want to talk to him at the moment." The source continued, "He is pissed off and feels like he let him down and threw all of the opportunities that he gave him down the toilet."

"Hopper looks up to his father a lot and he was doing really well after his latest stint in rehab, but he recently fell in with the wrong crowd in L.A. and he picked up right where he left off in his addiction," the source continued saying.

The 57-year-old actor, though, allegedly will be giving Hopper "one more chance and has ordered him to go rehab as soon as he is out." The insider added, "It isn't going to be one of those easy-breezy rehabs either. He wants him to check into a longterm facility and clean himself up for good, or else. This is the last straw for him and as much as this pains him, Hopper is just lucky he is still alive." The insider went on blaming Sean and Robin's messy divorce as the possible reason Hopper once again came back to the hole.