The Jim McDonald actor asked best friend and fellow actor Neil Morrissey to help with his proposal to Debbie Savage since she had already turned him down once.
She had previously insisted that the pair didn't need to get married, but Lawson said he knew she wouldn't refuse him a second time if the Men Behaving Badly star was present.
He told The Sun: "I know I'll be with Debbie for the rest of my life.
"When I met Debbie my life was a shambles. I had just left my second wife and barely had a penny. I couldn't survive without her now."
Savage said: "Neil burst into tears when I did. Then Charlie did. Then we ordered some good red wine."
Asked if Lawson is anything like Jim in real life, she joked: "If he was, I certainly wouldn't be marrying him. I'm so pleased I said yes - it finally just felt right."
The couple, who live in Prestbury, Cheshire, are arranging a summer wedding.
Jim McDonald, best known for his drama-filled marriage to Liz, was last seen in Corrie in 2011 holding up a bank.