25/06/2016 11:03 BST

Lady Gaga For Glastonbury? Singer Sparks Rumours Of Surprise Festival Set With Mark Ronson

Mother Monster has been spotted down on Worthy Farm.

Lady Gaga has sparked rumours she will perform a surprise set at Glastonbury

The US singer has reportedly been spotted backstage at the music festival in Pilton, Somerset, after arriving on site on Thursday (23 June). 

Danny Martindale via Getty Images
Lady Gaga played Glastonbury in 2009

There are whispers doing the rounds that she will team up with recent collaborator Mark Ronson for a DJ set in the Shangri-La area on Saturday night. 

A source told The Sun she was spotted milling around behind the Pyramid Stage, revealing: “She was clocked by a few people but she kept a low profile.

“She’s been saying to Mark for ages that she wanted to come to Glastonbury again."

However, if she does play the set, she faces a race against time to return to the States for a rather important prior engagement. 

“Mark is playing officially in the early hours of Sunday morning but they are trying to make another set work because she is due back in the States to meet the Dalai Llama on Sunday,” the festival insider added. 

Gaga is rumoured to be playing a surprise DJ set with Mark Ronson

Lady Gaga previously played Glastonbury in 2009, when she performed on the Other Stage.

No doubt she will be supporting close friend Adele at this year's festival, with the superstar set to headline the Pyramid Stage tonight.

Friday saw the likes of Jess Glynne, Disclosure, Bastille and Foals entertain the Worthy Farm crowd, while Muse played a barnstorming headline set.

Check out all the latest Glastonbury news and pics here

Tap the image below to launch the slideshow...

Photo gallery Glastonbury 2016 Day One See Gallery
Also on HuffPost