It's going to be a nasty child support battle for four-month-old Dream Kardashian.

A new report claims that if Rob Kardashian doesn't pay up with Blac Chyna, she will get revenge on him by exposing major secrets.

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“She has evidence of him partying around [their baby, Dream], calling her names, and grappling her when they’ve gotten into fights. Chyna’s got the proof!” a source told Radar Online. “She has told him he cannot be alone with the baby. She doesn’t trust him.”

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This comes on the heels of reports that momager Kris Jenner involved herself in the custody battle to ensure the model and business owner does not receive full custody over the on-again, off-again couple's daughter.

“Rob and Chyna have split for good, and now Rob wants full custody of Dream,” a source exclusively told In Touch. “Kris is 100 percent behind him. She doesn’t want him paying child support.”

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Rob and Chyna split again last month, though this time things were allegedly more amicable than their other splits. However, that doesn't mean the sock mogul is taking things well — and his loved ones are worried it's going to have a negative impact on his health.

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“Rob is a total mess right now. He is not dieting or exercising. He has even started drinking and smoking pot again,” the insider added.

The controversial couple started dating last January and by April they were engaged. One month later, they announced that they were expecting their first child together. In November, they welcomed baby Dream.

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Their recent split has also halted production on the second season of Rob & Chyna. In Touch also reported this week that this may have paved the way for Chy to reconcile with her fellow ex-fiancé and baby daddy, Tyga — who is the father of her four-year-old son, King Cairo.

Scroll through the gallery to see Dream's most adorable moments!