Hundreds poured into the Grand Ballroom of the Plaza Hotel on Wednesday night after a screening of Lifetime tv’s “Living Proof” that will air on October 18, about the development of the drug Herceptin, a successful treatment for breast cancer. Grabbing a champagne glass here and a lamb chop rib there, Neil Simon, Bebe Buell, Ivana Trump, Harvey Weinstein, and several doctors who told me that they liked the movie’s accurate depiction of the phases of scientific testing, found their places for an elegant seated dinner and a performance by the movie’s stars Harry Connick Jr. and Bernadette Peters. The hunky Harry Connick Jr. plays Dr. Dennis Slamon, the tireless doctor who refuses to give up on research when his funding dies out. Bernadette Peters, along with Trudie Styler and Tammy Blanchard who also attended the swank opening, superbly portray cancer patients who participated in the experiment. Ron Perelman, his Revlon company instrumental in the critical funding, took a bow at the screening as did Amanda Bynes who plays the doctor’s assistant. Introduced by one of the movie’s executive producers, Renee Zellweger, Bernadette Peters sang while Harry Connick Jr. played the movie’s original “Song of Hope” included in his upcoming Christmas CD. The hardest thing about playing this role, he quipped, was learning how to talk like a white guy. And everyone settled down to continue the party, Zellweger stunning in a lace sheath, a magnet for every man in the room. But the performance did not end there. ‘Round midnight, as the crowd dwindled, a couple was seen dry humping against the stage. Yes, this is a hotel and amused onlookers thought to suggest they get a room, but it was clear that no one, not even the Plaza’s security, would be able to break up this public display that had now progressed as the woman lifted up her knit dress, shifted the position of her pantyhose wrapping her legs around the man. Prodded by his wife, model Jill Goodacre, who offered to pay him, Harry Connick Jr. leapt onto the stage and played “Endless Love” for the couple. The man took a breather to give him a thumbs up, and security finally stopped the swooning. Perhaps they were moved by one theme in “Living Proof:” Live every minute.