The All About Tonight singer swapped her signature shorts for a demure dress, which was much more in keeping with the race course's strict dress code.
Pixie’s floral frock finished below the knee, in keeping with the ban on flesh flashing dresses, with the pretty over-sized print brightening up a showery day at the races.
So ladylike: Pixie Lott swaps her shorts for a demure floral frock for Ladies Day at Royal Ascot
As well as ditching the shorts, the 22-year-old swapped her usual towering heels for a significantly lower pair of black peep-toe pumps, completing her transformation from pop princess to lady-like race-goer.
Her Ascot look was a far cry from the singer's racy ensemble for the Pimm's Summer Garden launch party earlier this week where she arrived wearing a black and white, zipped coat, and little else.
'Feeling posh' Pixie ditched her favourite leg flashing shorts for a demure hemline for her day at the races
The singer wasn’t the only star to catch some action at the races today as Made In Chelsea star Francesca ‘Cheska’ Hull also went posh for a day out.
That takes the biscuit: Francesca Hull 'Cheska' Hull chose some bizarre accessories for Ladies Day
‘Off to Ascot with my crew of merry men! Wearing a fabulous @BahlsenBiscuits hat!!! Yes – it really does take the biscuit! Can’t wait! X’
Dapper: Ollie Locke proves it isn't just the ladies who pull out all the stops at Royal Ascot
Cheska's Made In Chelsea co-star was also at the races, with Ollie Locke cutting a dapper figure in a pink shirt and black suit with quirky multi-coloured trim.
Sporting figure: Victoria Pendleton went for a fifties style dress and a striking head piece
The star coordinated with a striking feathered fascinator and matching red lipstick.