Credit: Splash News Online

Suri's got a new BFF!

While Katie Holmes films her role as Jackie O in the upcoming History Channel mini-series The Kennedys, the 4-year-old fashionista has been bonding with one of her mommy's costars.

Earlier this week, the adorable tot was spotted on the Toronto set laughing and holding hands with the young actress who is playing Caroline Kennedy (the actress' name is unknown).

Sadly, their playtime ends whenever the girl needs to shoot scenes with Holmes, 31. (Suri usually chills with the film crew.) See more pics of Suri on set!

One day Suri could wind up in front of the cameras.

Asked if her daughter could be an actress, Holmes told at a NYC screening of The Extra Man Monday: "I think. I know that she can do whatever she wants and she’ll be great at it."