The former reality star - who rose to fame on 'The Hills' and 'Laguna Beach' - announced in February that she is expecting her second child with NFL player husband Jay Cutler, but she is suffering more "aches and pains" than she did when carrying her son Camden two years ago.
Speaking about raising the 20-month-old tot whilst pregnant, Kristin, 27, explained: "[There are] more aches and pains. With the first one you can sleep all day, but now I'm running after Camden."
Kristin - who now hosts E! show 'Fabulist' - insists her pregnancy hasn't prevented her from leading an active lifestyle and she has been trying to satisfy her craving for sweet foods with healthy snacks, though she has also been happy to indulge.
She added to 'Access Hollywood Live': "I'm such a healthy eater and I was working out until about two weeks ago, [I've been craving] apples with almond butter, but I do have a big sweet tooth. I've been eating ice cream sandwiches."
Meanwhile, Kristin says she couldn't be happier with her husband's parenting skills, and Jay is looking forward to having another boy.
Kristin gushed: "He's a really good dad. He's with [Camden] all the time. He's great, He's so excited that it's another boy. It's going to be interesting, surrounded by men, it could be worse!"