The songstress stepped out in LA for the premiere of her new romantic comedy film Baggage Claim and made quite an impression in a figure flattering outfit and some eye-catching bling on her ring finger.
Earlier this month, it was speculated that Christina's longtime beau had popped the question after photos emerged of her wearing a telling piece of jewellery.
And it was certainly hard to miss that huge diamond ring yesterday, as the singer strutted her stuff down the red carpet and showed off her new hand-candy.
She also drew attention to her petite frame in a black satin blazer that was cinched in at the waist and a pair of short leggings.
Her black ensemble was completed with some black heels, a tiny necklace and a red satin clutch.
The rumoured engagement ring wasn't the only new thing Christina was sporting though, since she switched up her hairstyle for the occasion too.
Over the last few months, the mum-of-one has been rocking a bright red weave, but last night (25 September) she opted for something a little more natural looking by debuting dark locks with light brown running through the ends.
Yesterday was extra special for Christina, as it was the eve of her 33rd birthday.
She announced on Instagram: "Bout to be 30 part 2 in 45 minutes.. September 26 baby! It's bout to be my REAL birthday!!!" and also revealed that she had received a couple of chicks as her birthday present!
Posting a snap of her adorable chicks on the social networking site, she wrote: "Meet my Birthday Babies!!!! Omg! I got chicks for my B-day!!! This.Is.Awesome!!!!! Thank you @ItsV0n! I wanted these so bad! AND they'll lay eggs by Easter!!! Violet is gonna be in LOVE! Hap---Burt-Day!!!!"
Christina has a three-year-old daughter called Violet with ex-husband and superstar music producer, The Dream.
She is currently competing on Dancing With The Stars along with Jersey Shore's Snooki.
What do you think of Christina's film premiere outfit? Let us know below, as the best comment each week wins £50!