Looks like Karrueche Tran found out about Chris Brown's baby news the same way the rest of us did- online!

An insider tells E! News that Brown's on-again, off-again girlfriend was completely blindsided by Tuesday's report by TMZ that Brown is the father of a 9-month-old baby girl with 31-year-old model Nia. She added that it was the last thing she ever thought she'd hear.

The source also claims that Brown has been attempting to contact Tran "all day, every day", but she refuses to answer his calls, with a second source saying that Tran is "really hurt, upset and pissed off."

Brown has yet to speak publicly on the reports, and his rep also declined to comment when contacted by E! News.

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