The physicist presented the actress with a bouquet of flowers after watching her play a woman who suffers from amyotrophic lateral sclerosis (ALS) in the New York production.
Hawking, who also suffers from ALS and communicates through a computerised voice box, earned a kiss from the star after confessing she was once his Hollywood crush.
In a post on her blog, Fonda writes, “I asked him if he thought I acted the ALS properly in the play… Letters and numbers darted around the screen… unfathomable. ‘You were…’ was all we saw for quite a while. I thought (arrogance?) that maybe he was going to say, ‘You were brilliant!’ When at last he finished the sentence it read, ‘You were my heart-throb,’ and… the (computerised) voice said the words aloud.
“I about fainted and everyone broke into laughter. ‘What’s this ‘were’?’ I asked. ‘What am I now, chopped liver?’ And I could see he was laughing although all I saw was his face blushing and his cheek moving slightly. But I know he was laughing. ‘It must have been Barbarella, right?’ I asked. And he typed out ‘Yes.'”