Yes, they knew each other.
Here’s the story:
“I owe Marilyn Monroe a real debt…it was because of her that I played the Mocambo, a very popular nightclub in the ’50s. She personally called the owner of the Mocambo, and told him she wanted me booked immediately, and if he would do it, she promised she would take a front table every night. She told him – and it was true, due to Marilyn’s superstar status – that the press would go wild. The owner said yes, and Marilyn was there, front table, every night. The press went overboard. After that, I never had to play a small jazz club again. She was an unusual woman – and ahead of her time and she didn’t know it.” – Ella Fitzgerald
How wonderful these two met. How wonderful Marilyn helped Ella broaden her audience. And how wonderful Ella remembered Marilyn and her kindness so fondly.
Speaking Plainly 