Q: Who is the hot blonde girl in the McDonald’s “Grilled Onion Cheddar Burger” commercial? A: Caitlin Gerard
Caitlin is an L.A. actress. She has appeared in movies like “The Social Network”, “Magic Mike”, and the horror movie “Smiley”.
This is her IMDb and Twitter page.
Here is a profile and demo reel of Caitlin. And this is another profile/interview.