EXCLUSIVE PHOTOS - Brad Pitt Takes The Twins To The Park

Look at doting dad Brad Pitt! Yep, the superstar does normal daddy things like take his kids to the park for some afternoon fun.

Vivienne and Knox, almost three years old, attacked the slide and the swings at a Hollywood park while proud papa Pitt joined in, even taking pictures with his cell phone. Mom Angelina Jolie wasn't around but the kids didn't mind -- they had 100% of dad's attention!

Our photographer said of Pitt:

"It was the cutest thing ever. Brad is totally in love with these two and they all seemed so happy. You would think he'd have a nanny with him but he was on his own. He really wanted some alone time with his youngest kids."

SO cute! And look at little Viv ... she looks like she could be sister Shiloh's twin!