Teen Mom-turned-author Farrah Abraham may talk about her substance abuse issues as if they're a thing of the past. But according to a close friend of the MTV reality star, that's hardly the case. The 20-year-old single mom's pal tells Radaronline.com that Abraham is steadily abusing the drugs Adderall and Xanax, along with excessive amounts of alcohol. Austin Mathouser recently spent one wild night in Tinsletown with Abraham, who reportedly partied like a rock star. She tells Radaronline.com, "When she was in Hollywood to celebrate her 21st birthday we partied at Geisha House and Kiss Lounge in Beso. All throughout dinner and the club she talked about how she does Xanax and Adderall to stay up and energized. She frequented the bathroom that whole night taking them to stay up." As anybody well knows, except maybe Abraham, pill popping and booze do not a good combination make. Abraham was apparently a trainwreck by the end of the night. Says Austin: "She got very drunk. She was grabbing on guys and girls, and even hit one guy that didn't want to dance with her. She got really sloppy and was throwing her drinks around and yelling." Abraham supposedly uses Adderall to put some extra pep in her step when she's on the go. Austin adds, "Farrah said she does Adderall before every event that she attends." The revelations are disturbing considering that Abraham cops to abusing pot and cocaine in her new memoir My Teenage Dream Ended. She also admits to thinking about suicide after her estranged boyfriend and baby daddy perished in a car accident while she was pregnant with daughter Sophia. Austin says that Abraham has hardly addressed her substance abuse issues. Instead she's simply made the transition from one drug to another. Austin tells Radaronline.com she hopes her friend turns it around for the sake of little Sophia, "It's sad because she has a little one. Sophia should be her 'high,' her enjoyment and happiness. I've personally lived with drug addicts, and it's not fair to the child at all."