Katherine Heigl: Playing a Selfish, Crazy Character Was ‘Weirdly Freeing’

This video is unavailable because we were unable to load a message from our sponsors.

If you are using ad-blocking software, please disable it and reload the page.

Katherine Heigl Talks About Her Adorable Kids

Q&A with Organizational Pro Peter Walsh + Dermatologist Shares A…

Actor Hank Azaria + Freezer Meals + Artichokes 2 Ways with Rach

See Inside Barbara Corcoran's Stunning NY Apartment + It's Steak…

How to Make Chicken and Lobster Piccata | Richard Blais

Donnie Wahlberg Spills Details About NKOTB's First Ever Conventi…

Donnie Wahlberg + Jenny McCarthy Say Rach Is Such a "Joy" + Look…

The Best Moments From 17 Seasons of the Show Will Make You Laugh…

How to Make Crabby Carbonara | Rachael Ray

Rach Chats "Firsts" In Flashback From Our First Episode Ever In …

How to Make Apple-Cider Braised Pork Chop Sandwiches with Onion …

Rach's Chef Pals Say Goodbye to Show in Surprise Video Message

How to Make Sesame Cookies | Buddy Valastro

How to Make Tortilla with Potatoes, Piquillo Peppers and Mancheg…

How to Make Shrimp Burgers | Jacques Pepin

How to Make Spanakopipasta | Rachael Ray

Andrew McCarthy Chokes Up Discussing Emotional Trip to Spain wit…

Celebrity Guests Send Farewell Messages After 17 Seasons of the …

Andrew McCarthy Teases Upcoming "Brat Pack" Reunion Special

Michelle Obama Toasts Rach's 17 Years on the Air With a Heartfel…

Katherine Heigl has a lot going on (to say the least). The actress and mom’s creepy new movie “Unforgettable” is in theaters and she has an adorable brand-new baby boy.

Heigl gave birth to son Joshua (named for his dad, Katherine’s husband of 10 years, musician Josh Kelley) in December, and big sisters Naleigh and Adalaide couldn’t have been happier to welcome him. Katherine tells Rach, “They are so excited, they’re too excited. In fact, I have to kind of beat them off with a stick, [saying] guys, I got this!”

Baby Joshua has hit the road with her to promote “Unforgettable,” which both Rach and Katherine warn is off the charts when it comes to the creepiness factor. Katherine stars as a jilted wife who is not happy when her ex-husband comes home with a beautiful new girlfriend, played by Rosario Dawson. Her character doesn’t take it well, and goes a bit cuckoo, which Katherine found fun.

WATCH: Jenna Elfman on Her Adorable Family + New Imaginary Friend-Themed Sitcom

“Women have a tendency to try to make other people happy and take care of other people’s needs and that’s not Tessa,” she says about her character. “Tessa is all about Tessa and what she wants, and how she’s gonna get it at any cost. There was something sort of weirdly freeing in that.”

Katherine also enjoyed shooting intensely physical fight scenes with Rosario, which she says isn’t something female actors get to do all the time, and loved working with Cheryl Ladd, who co-stars as Tess’ cold-as-ice mother.

WATCH: Josh Duhamel Wanted to Be a Football Player, but It’s Probably a Good Thing He Became a Movie Star

If grappling on-screen and raising three kids wasn’t enough, Katherine also has an animal advocacy foundation that funds no-kill shelters around the country. “We want to stop the senseless killing of all these healthy adoptable animals,” she says. Click here to find out how you can help.

Watch the video above to see some adorable snaps of Katherine as a child model, and to see more photos of her adorable family, and check out the video below to hear more about “Unforgettable.”