Hold. The. Phone. Is Blac Chyna pregnant?! Rob Kardashian's famous ex-fiancée stepped out over the weekend rockin' a tight, light pink dress for her son King's graduation — and it looked like she was sporting a baby bump. The 30-year-old, who shares daughter Dream with the sock designer, was all smiles as she held several balloons, but Rob certainly isn't laughing. A source tells In Touch exclusively that Rob is "pissed."

"If Blac Chyna is pregnant, don't expect Rob to take care of the baby financially," our source dished. "Rob knows he's not the father and at this point, he's so done with her. He's pissed and feels like Chyna's playing him. He's been going to bat for her, trying to get her back on E!, trying to get her and Kris on good terms so they can stop fighting." They added, "He's even been cashing her out for Dream and King. For Chyna's sake, he hopes she's not pregnant."

ICYMI, just hours after he shared happy Fourth of July pics with his daughter last year, Rob accused his baby mama of "f–king me and then this dude right after." He then shared a picture of her private parts online for all the world to see. "This is from Chyna yesterday to me. I never been so disrespected in my life. I just bought her $250K of jewelry yesterday," he captioned a series of racy texts. "This woman is so disrespectful and I don't care."

In the aftermath of the revenge porn scandal, Chyna began dating YBN Almighty Jay, an 18-year-old rapper from Texas. To further fuel pregnancy rumors, he told Page Six in April, "I don't wear condoms. I would not want to f–k a bitch I did not want to get pregnant. If Chyna got pregnant, I would keep that s–t like 'ohh daddy love you.' I love that a–." Uh, wut?

Only time will tell if she's really expecting! Or if that bump is just the product of a really big lunch…

Love the Kardashian kids? Join our Kardashian kids Facebook group so you don't miss any of the cuteness!

Have a tip? Send it to us! Email In Touch at contact@intouchweekly.com.