The day after her death, a source told ET that Roberts' close friends gathered together at her home in Los Angeles and gave a toast in her honor with her favorite champagne, Dom Perignon.
"We shared memories, laughed and cried together," the source revealed. "It was a beautiful evening. She was always there for her friends. We loved her very much."
Upon hearing the news, Romano also paid tribute to the five-time Emmy-winning actress in a statement given to ET.
"Doris Roberts had an energy and a spirit that amazed me," he said. "She never stopped. Whether working professionally or with her many charities, or just nurturing and mentoring a green young comic trying to make it as an actor, she did everything with such a grand love for life and people and I will miss her dearly."
Roberts' other onscreen son, Brad Garrett, also gave a statement, echoing Romano's sentiments.
"I am deeply saddened by the passing of Doris Roberts, an amazing lady and brilliant actor," his statement read. "Doris was vibrant and full of life both on and off the stage, and I am so grateful we shared so many wonderful memories. I will miss her greatly and will always remember her incredible kindness, humor, talent and heart."
To hear more on the beautiful tributes penned by her closest friends, family and co-stars, watch the video below.