Zac Efron was in rehab reportedly due to cocaine and not alcohol. He is the latest reported celebrity to have fallen victim to the addiction. Here is a list of top 5 celebrities who had cocaine addiction problems.

Whitney Houston:

One of the biggest tragedies in Hollywood was the untimely death of the star Whitney Houston. The star had an untimely death at the age of 48. Her body was found in a hotel bathtub. Heart disease and cocaine use were said to be the cause of her death. She shot to fame as a singer with her debut album "Whitney Houston." The celebrated singer turned actress was last seen in the 2012 movie "Sparkle."

Robert Downey Jr:

The star famous for his role in the "Ironman" movies, has had his share of drugs problem. He was reportedly arrested as early as 1987 and later in 1996. Repeated stints at rehab did not offer him much help. Over the past decade, however, the star seems to have overcome his addiction and is seen focusing on his career. Fans simply seem to be addicted to his famous one liners and humorous attitude.

Angelina Jolie:

Perhaps the biggest name from the A list of Hollywood, Angelina Jolie had cocaine problems when she was in her 20s. She first spoke about her problems in the year 2011, and by that time she seemed to have successfully overcome her drug problem. The star is currently rasing a family as she prepares for a marriage with Brad Pitt.

Steven Tyler:

The star of the rock band "Aerosmith" wrote in his "Rollingstone" Web site that he had been taking drugs since he was sixteen. He said that the doctors did not consider cocaine to be addicting. The lifestyle apparently cost him millions of dollars, the star admitted in another interview.

Drew Barrymore:

Drew Barrymore, famous for her role in many movies like "50 First Dates" and "Charlie's Angels," reportedly started taking cocaine from a tender age of thirteen. Her stint at rehab cleared her of the addiction, making her one of the few child actors to become a successful star, on growing up.

Hollywood Addiction