When she's dressed up to the nines she looks fab, but her cool-yet-casual style is also bang on trend as showcased at the launch of the Virgin STRIVE Challenge.
The 25-year-old, who is sixth in line for the throne, opted for a black and white monochrome frock when she arrived to support friend Sam Branson (Sir Richard's son). She finished her look with a staple black cardigan and a pair of black pumps.
Beatrice hung out with Sam's wife Isabella (whose sister is Prince Harry's ex-girlfriend Cressida Bonas) and sister Holly, who announced earlier this week that she was pregnant with twins, and quite bizarrely Natalie Imbruglia was there too.
The royal got into the spirit of things by putting on a Big Change charity tee for the event at the O2 Arena in London.
The Virgin STRIVE Challenge is a 1,000km journey from London to the Matterhorn in the Alps with a series of marathons, rowing, cycling, hiking and climbing en route.
Meanwhile, sister Princess Eugenie has been celebrating being offered a full time position at auction house Paddle8 after completing a 12 month internship there.
LOVE PRINCESS BEA'S STYLE? Well check out some of her past looks here. She's definitely come a long way in the style stakes over the years.