Mariah Carey's Celeb Hairdresser Busted with Bag of Pills at Buffalo Airport

Hollywood hairdresser Danielle Priano was busted at the Buffalo Int'l Airport with several containers of illegal prescription drugs.

Priano -- known for working with stars like Mariah Carey and J Lo -- was detained February 12 while attempting to board a flight to NYC. We're told the Buffalo PD obtained a search warrant to check her duffel bag and purse ... and found nearly 400 Rx pills.

According to court docs ... the pills included Adderall, oxycodone, hydrocodone, Xanax and a Suboxone strip commonly used to treat addiction. Priano was charged with 4 counts of possession of a controlled substance. She pled not guilty to all 4 counts.

Priano recently appeared on "Mariah's World" as Carey's hairstylist.