Kristen Stewart weight gain for new 'Still Alice' movie role, Robert Pattinson finds curvier look sexy? Pregnant rumors NOT true!

The infamous gossip webloid HollywoodLife.com alleges that "Twilight" sweetheart Kristen Stewart recently gained about 15-pounds. And it's not because she's "wallowing" in Robert Pattinson heartbreak. In fact, K-Stew's preparing for her new role in the upcoming drama, "Still Alice."

Check out before and after pictures of Stewart's "weight gain" here. The 23-year-old actress appears a little curvier, but she still looks great!

"In the before photos, Kristen [who is 5'5"] appears to weigh approximately 115 pounds, now she appears to weigh 125 to 130 pounds. You can see her stomach in her jeans now gives her a slight 'muffin top' around her waist and her thighs are a bit heavier," LA-registered dietician and celebrity nutritionist Lisa Defazio tells HollywoodLife. "She definitely has gained weight, however, it is not a bad thing! She was getting to be too thin anyway, and now it appears she is eating, looks healthy, happy and has some curves."

Defazio goes on to explain:

"When trying to gain weight, there is a right and wrong way to do it. Increasing calories is important, but the quality of the calories is just as important. An actor should not just eat cookies, chips and fast food! The fat, salt and cholesterol will accumulate in the body. The healthy way to gain weight is by eating lean protein like fish, chicken and beans, drinking high calorie weight gain protein shakes, including carbohydrates like rice and pasta, and fruits and vegetables... Overall, I like the fact that Kristen is not afraid to show her curves, and young women obsessed with being skinny may relax a little and follow her lead."

Some fans initially thought that K-Stew was pregnant, which is totally ridiculous. She's way too busy with her career right now, and she hasn't even seen Pattinson in weeks! Another insider reveals:

"Kristen is absolutely not pregnant. She has put on a few extra pounds for a movie role and that's it. She's already so thin so a few more pounds makes a noticeable difference, she's still thin... Don't get me wrong, Kristen would love to be a mom one day and have little rugrats running around, but not for a while. Her priority right now is her work."

Will Robsten ever work out in the end? Maybe R-Patz is turned-on by Stewart's curvier look!