Rob refuses to sign prenup with BlacLos Angeles, Feb 16 (AZINS) Reality TV star Rob Kardashian says he wants "nothing to do with prenup" when it comes to marrying model Blac Chyna.

"Rob's so desperate and determined to get her to marry him, he's offered to go without a prenup," the source reveals to Radar online, reports aceshowbiz.com.

The source added: "This has gone down like a lead balloon with the family, who are terrified of Chyna's gold-digging reputation. He's so insecure he just doesn't think she'll marry him with a prenup, but no one can convince him otherwise."

Rob's sisters have been worrying about their brother following Chyna's cheating news. Previous report said Kim, Khloe and Kourtney Kardashian hired a private investigator to "follow" the 28-year-old model and "catch her cheating."