McAdams and Lucas have Jude Law to thank for introducing them to one another.
Law, who is good friends with Lucas, introduced his friend to McAdams on the set of the film Sherlock Holmes.
A source revealed that the two stars seem to be very happy together. "Rachel is very comfortable with him. And now that Sherlock filming has moved from the U.K. to Josh’s home, NYC, she’s having a great time hanging out with him in the city,” the source told Life & Style magazine.
McAdams and Lucas were seen kissing at the recent inauguration festivities for Barack Obama on January 20.