Is Chris Brown Engaged? Karrueche Tran Left 'Speechless' By Diamond Ring

Rihanna is NOT going to be happy...

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Rihanna is not going to like this! Speculation mounts that Chris Brown is engaged to model girlfriend Karrueche Tran.

The couple have been pretty loved up recently and it seems they may soon be walking down the aisle.

The Vietnamese model posted a picture on Twitter of a diamond ring the rapper had given her for her 24th birthday with the message: “Kind of speechless right now…”

Although neither have confirmed that they are engaged, the ring is very obviously on the wedding finger on the left hand.

She followed up the picture with another cryptic tweet: “you’ve made me the happiest birthday girl EVER.”

23 year-old Brown obviously wanted to make the day as special as possible and has already reportedly shelled out a whopping $10,000 on Karrueche’s birthday celebrations. Are there wedding bells in this couple’s future?

Or perhaps the ‘Champion’ singer was feeling guilty for flirting with his ex-girlfriend Rihanna? The pair, who split in 2009 collaborated on two tracks earlier this year and also reportedly spent the ‘Rude Boy’ star’s birthday together.

Chris Brown And Rihanna's Doomed Romance

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Chris Brown, Timbaland and Rihanna on MTV's 'Total Request Live: 2007 VMA Nomination Special,' in August 2007. (