The singer, 22, headlined the festival's 1Xtra stage on Friday (July 26) and looked pretty in pink - the brightest shade you can imagine!
Wearing a cerise PVC all-in-one with hood, Rita treated the crowd in Stratford-upon-Avon, Warwickshire, to some of her biggest hits.
During the set, Rita dropped the hood to reveal her cute double topknot - a 90s trend which is back this summer!
Rita must have been in a philosophical mood earlier in the day, as she posted the following message on her Twitter account: "My life. Today you made me think anything is possible. I love you Mami."
The touching message was aimed at her mum Vera, an NHS psychiatrist.
It's a busy weekend for Rita, as she's also performing at the South Island Festival tonight (Saturday 27 July), a two-day event at Quex Park, in Birchington.
We can't wait to see what she'll wear this time!
Do you like Rita's look? Tell us what you think below!
Watch the video for Rita's single 'R.I.P. ft. Tinie Tempah' below: