The Bajan singer ended her night at The Box nightclub with a cut knee after being 'assaulted' by the stranger outside the exclusive nightspot who hurled abuse at her regarding her union with Brown.
According to eye-witnesses, the injury came after a the unidentified fan threw a bottle of Lucozade at the singer, before flinging a stream of insults about her on-off boyfriend.
In the commotion, she fell against a shop shutter and grazed her knee.
The injury was deemed serious enough for her to require immediate medical attention, according to Media Take Out.
The S&M singer is in the capital for London Fashion Week where she presented her debut clothing collection for high street behemoth River Island.
Rihanna enjoying a night of clubbing with Cara Delevingne on Saturday following her designer debut.
The 24-year-old emerged from trendy venue The Box in England’s capital city looking well held together in the same ensemble she donned for her catwalk presentation.
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Where did that come from: Rihanna investigated the small cut as she left the club
Having a laugh: Rihanna went clubbing with model Cara Delevingne on Saturday
She linked arms with famous clothes horses Melissa Forde and Cara on the end.
The 20-year-old sister of model Poppy Delevingne looked a little worse for wear as she appeared with dishevelled hair and giggling her way to their car.
She also seemed to be stumbling down the street but rather than perhaps going overboard with her alcohol consumption, her wobbling may have been down to her trick footwear.
Taking her through the night: Rihanna donned the same LBD she had worn earlier in the day
Take a bow: Rihanna and Cara Delevingne show how to party hard after the singer's debut show
Cara donned thigh-high boots with denim hot pants as well as a red vest and printed jacket.
The slender star also lugged a heavy bag over her shoulder as they made their way home from the party session.
They were also joined by Rihanna’s friend Melissa Forde, who revealed the party didn’t end there on her Instagram page.
Long day: Cara seemed a little worse for wear as they emerged from The Box nightclub
Flaunting her frame: Cara wore lace-up black boots with denim hot pants
Girl gang: The ladies got plenty of attention from onlookers
Feeling the pressure? Rihanna and Cara scramble past fans
She posted images of herself with Cara and model Jourdan Dunn relaxing on a sofa in a picture which she tagged them as a ‘clique’ and referred to it as the ‘afterparty’.
Melissa also shared a snap of herself smoking a suspicious cigarette as well as a snap of Rihanna dancing in the kitchen area of their lodgings.
Sunglasses at night: Rihanna celebrates her debut show with a night out on the tiles
She's made it! Cara Delevingne parties with Made In Chelsea's Rosie Fortescue
Looking good: Rihanna of course, makes the most of London clubs after debuting her show
You could have dressed up! Louise Smith leaves the show in a rather unusual top
Nice on Jaime! Ms Winstone adds some unusual style to the event
Looking good! V V Brown and Tyson Beckford are obviously fans
The after party: Rihanna's friend shared a snap of her dancing after her catwalk show
Clique: Melissa Forde poseted a snap of her and Cara with model Jourdan Dunn
Bad influence? Melissa shared a snap of her smoking a suspicious cigarette
The Barbadian singer wowed style critics as she presented her first range for River Island on that day.
While the collection appeared to be a hit with fashionistas, Rihanna ensured she gained full marks in the sartorial stakes too, wearing a figure-hugging LBD to take to the stage at the end of the show.
Keeping it simple: Rihanna took a bow after her Rihanna for River Island Fashion show wearing a tight LBD and simple gold jewellery
Rihanna teamed the tight dress with a pair of black strappy heels and a series of simple gold jewellery pieces, opting for a simple style.
She wore her hair lose around her shoulders and she sported dark plum lipstick and a matching colour on her nails.
She was seen waving to the crowd, which included the likes of Cara Delevingne, Mollie King and Jourdan Dunn after debuting the high street collection.
Round of applause: The 24-year-old singer appeared on the stage after her show had finished and was clapped by her River Island colleagues as well as the crowd
She's a hit: Rihanna beamed as she waves to fans in the crowd show off her simple dress with a series of gold jewellery pieces
Overwhelmed: The singer seemed thrilled with the reception she received from the fashion pack
The Stay singer seemed delighted by the reception from the crowd and was seen with a broad smile plastered across her face.
MailOnline's Toni Jones labelled the much-hyped collection 'wearable and impressive'.
She said: 'While the feel of the collection was quite young, Rihanna also included some seriously elegant maxi dresses, dip-hemmed shirts and digital print separates that will find a home in the 30 something market.'
Better late than never! Rihanna made journalists and fashionistas wait more than a hour for her show in a wareouse
Over the moon! The singer later tweeted a message that seemed to suggest she was delighted with how the show played out
In with the fashion crowd: Cara Delevingne and Jourdan Dunn were among the guests at the show
