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Chris Brown, Karrueche Tran

PAPSFIRST/Splash News

So True So False, STSF

Chris Brown could be the poster boy for guys who are not marriage material just yet.

But rumor has it that the 21-year-old singer is engaged to his model girlfriend, Karrueche Tran, 22, and that he popped the question over the phone!

Well, Tran was by his side throughout the whole Good Morning America debacle last month, so did Brown figure he better lock this patient hottie down, ASAP?

Hang onto your Zales receipts, kids, because this rumor is...

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