For the occasion, Pippa chose a plunging satin gown in butter yellow adorned with black and colourful flowers. She paired the look with killer black heels and an of-the-era capped sleeve shrug.
Kate looked equally as fabulous for the outing, wearing a champagne-hued lace gown complete with black patent peep-toe heels. Both sisters opted for the ultimate noughties glam, meaning black kohl liner was on the menu.
As for hair, Pippa had her short, choppy layers styled immaculately straight, while Kate echoed the lengthy look, but flipped her locks to one side for a very 2000's side parting.
Despite the photo being nearly 20 years old, you cannot deny their fashionista prowess, which has only gotten better with time.
But their jaunt in 2007 wasn't the only time they were pictured living their best Chelsea girl lives.
Another throwback favourite has to be when a flawlessly sun-kissed legs. Taking her Chelsea-girl style to Northumberland, Pippa headed off to a wedding at St Michael's Church in Alnwick.
For the occasion, she sported a black rara coat dres,s which she wore over a hot pink gown. Flaunting her tanned legs, not forgetting the matching hot pink fascinator she added to complete the killer look.
Meanwhile, strutting along the King's road was never off the table when it came to the Middleton sisters. One spectacular sartorial moment saw Pippa in 2011, making her way along the perfectly paved roads in SW3.
The outfit in question was a fabulous waist-cinching dress in a lilac hue and adorned with white flowers. Pippa was the toast of the King's road, completing her ensemble with a pair of silver cork wedges, which she matched with her silver handbag.
As for evening wear, Pippa always knew how to turn up the glamour, and the proof was in the pudding when she attended the Berkeley Square End Of Summer Ball in 2008.
Stepping out in a silk halterneck ensemble of dreams. The tanned beauty completed her look with the ultimate pair of noughties killer heels: white satin and covered in diamantes.