Two sorority sisters who died aboard billionaire Chris Cline’s doomed Bahamas helicopter flight were “attached at the hip,” according to a report.

Cline’s daughter, Kameron, and her best friend, Brittney Searson, were “inseparable” at The Benjamin School in Palm Beach, Fla., before continuing their studies at Louisiana State University together, news station WPEC reported.

“Both were inseparable, just terrific,” recalled Benjamin School social studies teacher Steven Anderson. “They were very good students, cheerful and lit up the room when they were in there. It was a privilege to teach them. They made teaching rewarding.”

Kameron, 22, and Searson, 21 — who were Phi Mu sorority sisters — graduated in the spring before the crash, which also killed Kameron’s father, a coal mining tycoon and philanthropist, and four other passengers.

The girls’ deaths were confirmed Friday by the private high school. A 2015 yearbook described the pair as being “attached at the hip,” the Palm Beach Post reported.

“It is with the heaviest hearts we share that TBS alumnae Kameron Cline ‘15 and Brittney Searson ‘15 have passed away. The entire Benjamin community grieves alongside the Cline and Searson families along with the other families dealing with this tragedy,” the Benjamin School said in a statement.

Another high school pal, Natalie Newman, said the pair “both had such unique and beautiful qualities that taught me so much about life.

“You both are such bright and beautiful people and I wish I could see you blossom into this world,” Newman wrote on Instagram. “I will cherish the millions of things we did together- and how much fun we had doing those things.”

In addition to Cline, his daughter and Searson, pilot Geoffrey Lee Painter, 52, and family friend David Jude, 52, of Kentucky also were among those killed when the helicopter went down minutes after taking off around 2 a.m. July 4.

The cause of the crash is under investigation. The wreckage was discovered about 2 miles from Cline’s private island and will be brought to an accident investigation facility in Fort Pierce, Fla.

With Post wires