United Kingdom, June 26 -- Didi Conn is bringing her Grease co-stars together to mark the film's 50th anniversary, and the celebration will also support her son.

Grease will turn 50 years old in 2028, and Conn - who portrayed Frenchy Facciano in the 1978 motion picture - revealed a "really exciting" upcoming reunion will help to benefit The Center for Discovery in Hurleyville, New York, where her son, Danny, who has autism, receives care.

Speaking to PEOPLE magazine about the reunion, she said of her co-stars: "We are in touch constantly and now, we're doing something really exciting for our 50th.

"I can't quite talk about it yet."

Didi is a huge supporter of The Center for Discovery, so much so she described it as "the most remarkabl...