Nicole Richie has been bouncing back and forth for most of her career.

The socialite has been in rehab for heroin addiction and was recently arrested for driving under the influence of marijuana and prescription drug Vicodin.

To make the situation worse, Richie has also lost a substantial amount of weight since she debuted on “The Simple Life” with her BFF Paris Hilton. Now, reports are suggesting that the stylish star has moved away from illegal drugs and on to Adderall, the drug given to ADD suffers.

Sources confirm that Richie uses the drug to stay awake and curb her appetite.

One friend told In Touch Weekly magazine, “She loves Adderall because she stays awake, and it makes her not want to eat… and she takes it even more when she’s filming.”

While Richie no longer looks as sickly thin as she did last summer, her weight at the time of her December arrest was 85 pounds.

An insider said, “She’s taking more and more lately.”

Richie’s rep denies that the star is using drugs.

Many of Hollywood’s ‘It’ girls have been linked to drugs lately. Lindsay Lohan has spent time in rehab, Britney Spears is currently undergoing treatment and Mischa Barton’s younger sister, Hania, has admitted to using drugs and was shipped off to a facility.