Kelly Osbourne had a nervous breakdown during a recent flight likely due to sadness over her brother’s newly-diagnosed disease.

Kelly’s brother, Jack Osbourne has recently came out with the fact that he was diagnosed with Multiple Sclerosis.

It is being alleged that Kelly was drinking heavily while on a flight, trying to drown her sorrows in alcohol.

“I saw a flight attendant bring alcoholic beverages over to Kelly’s section in First Class at least four or five times,” the eyewitness reveals.

“And when we landed just after midnight, her assistant, who flew with her, had to help her off the plane. They were the last to leave. There was already a burly security guard waiting for them at the arrivals lounge,” adds the source.

Apparently the “Fashion Police” star was totally disheveled and acting erratic. “Kelly’s hair was hanging down, she was mumbling and her makeup was a mess,”

Kelly even somewhat confirmed the breakdown on her Twitter when she posted, “had a nerves breakdown yesterday that was cool! ‪#Not‬”

Osbourne, who has had quite a past with drugs and alcohol, may be slipping back to old way to try and cope with her brother’s diagnosis.

“I wouldn’t be surprised at all if the sudden sad news about Jack helped push her into a dark place again. But she’ll come through it OK,” says a close source.

Well let’s hope Kelly stays on the right path!