The Mean Girls star recently denied claims that she was causing trouble during filming of the horror movie spoof.
Reports earlier this week suggested that Lohan had "freaked out" regarding a scene that made fun of her personal life and walked out.
However, The New York Post reports that the actress has now shot a steamy bedroom scene for the upcoming film.
"They were ad-libbing. They were joking that they've both had a lot of issues over the past couple of years," a source explained, adding, "They even shared some playful pillow talk during shooting."
Another source revealed: "Lindsay was a great sport. She was poking fun at herself, and she really got into it and seemed to enjoy it.
"Lindsay was scared by a sound effect [during filming], and actually jumped into Charlie's arms. But everything went smoothly and surprisingly on schedule."
Scary Movie 5 is due for release in April 2013.