The R&B songstress is thought to have been dating Jas since 2010 and it is even speculated that the happy couple have actually been engaged for the last four months, as Jas is rumoured to have popped the question back in April.
Although the music industry pair have kept their lips sealed on the subject, a source close to Christina confirmed the engagement to People magazine, saying: "He's a great match for her".
On top of that, the 'Dip It Low' singer has also been pictured wearing a pretty impressive rock on her ring finger for some time now. However, she has yet to announce the meaning behind her eye-catching bling.
Three weeks ago, Jas posted a close-up of the whopping 11.5 carat diamond ring he bought for Christina on his Instagram page, along with the intriguing caption: "Someone is loved lol #chanelboybag #rolex #11.5caratring @christinamilian damn someone must love u lol"
Christina, 31, was previously married to superstar music producer The Dream (real name Terius Nash), who is also the father of her three-year-old daughter Violet.
However, the couple separated just three months after marring in late 2009. Christina was pregnant at the time.
Reveal have contacted Christina's rep for a comment.
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Watch Christina Milian's 'Dip It Low' video below: