The pop star is the latest celeb to show off a mouth full of metal as part of the current grill craze, which has already lured in stars such as Katy Perry, Kylie Jenner and Madonna.
Rita, 22, opted for a relatively subtle (in comparison to others) silver grill on her bottom teeth, as opposed to going all out with diamonds like fellow singer Katy at the MTV VMAs in August.
And she wasn't shy about baring her gnashes for the cameras either.
Rita was pictured walking arriving back in London from Paris with her team and pulled a few choice poses for the waiting paps, giving them a good look at her new accessory.
She teamed her grill with an all tartan outfit, that resembled the trousers her BFF Cara Delevingne had been seen in just yesterday (1 October). Perhaps the two girls have been swapping style tips?
Her leather and tartan jacket - which she sported last night at a film screening - and her matching bottoms were worn with a long black T-shirt, a House Of Holland snapback cap and some smart white loafers.
Rita has been in Paris over the last couple of days for Fashion Week.
While there, she stepped out in a variety of interesting ensembles and made sure to spend some quality time with Cara.
What do you think of Rita's grill? Let us know below, as the best comment each week wins £50!