The 22-year-old pop star, who has been dating model Oliver for three years, fulfilled her maid of honour duties earlier this month at her sister's wedding, but she's in no rush to walk down the aisle herself just yet.
Speaking at the music festival in the exclusive VIP section of the Mahiki Coconut Backstage Bar, Pixie told Reveal: "I'm too young [for marriage] I think right now, but I love Ollie, he's just so lovely."
Pixie and 25-year-old Oliver put on a public display of affection as they enjoyed pineapple cocktails and partied with the other guests.
The 'Mama Do' hitmaker, who styled her hair in cute, floral plaits especially for the festival, added: "My sister got married two weeks ago and it was just so lovely. The cake was amazing too, it was the best part!"
Pixie and Oliver were seen cuddling and smooching for the best part of the night, but they also broke free to challenge each other to a game of limbo.
Oliver was seen dancing the limbo first, but Pixie soon stepped in and showed him how it's done in style!
The smitten couple celebrated their three-year anniversary together on 22 July, with Oliver tweeting at the time: "3 years today with my dink @pixiesongs xxx."
Check out other stars at this year's Virgin Media V Festival below:
Copyright: Rex Features AKEM