Lily Allen previously performed at the festival in 2009. AFP/Getty Images

Lily Allen has revealed that she is upset that she will not be performing at the 2014 T in the Park Festival this weekend.

Taking to Twitter, the singer, who made a sensational comeback earlier this year, admitted that it was always fun taking to the stage at the three-day event.

She also got nostalgic by posting her cringeworthy 2007 interview with Radio 1 DJs Zane Lowe and Lauren Laverne at T in the Park.

And fans made it clear her absence would be felt.

There's a good chance the mum-of-two is still on a high following her set at this year's Glastonbury, where she flashed her knickers.

She took to the stage in front of over 100,000 people at the Worthy Farm site in a pink haze before deicating her track 'F**k you' to Fifa boss Sepp Blatter.

While Allen will not be at T in the Park, fans can look forward to performances from the likes of Pharrell Williams, Calvin Harris and Ellie Goulding.