Pregnant Kim Kardashian's 65-LB WEIGHT GAIN!

According to Star, Kim Kardashian is "melting down" over her fuller figure.

"Kim is well aware that she's famous for her amazing body and had no idea that pregnancy would change it so much."

"She's looking at old pictures of herself on her computer and her phone for literally hours at a time, pining for her prepregnancy body. She is seriously melting down!"

"It's likely around 65 lbs. so far!"

"Kim is desperate to stop gaining so much weight, but she can't seem to get it under control," adding, "She cries every other day, and she's scared to see how big she'll get."

"She's called her sisters, crying, because she thinks her butt looks like 'a big hunk of cheese,'" tattles the insider, who was apparently on three-way with Kim, Khloe and Kourtney for these alleged conversations.