'Starry Eyed' hitmaker Ellie sung a string of hits on the 'Other Stage' on Sunday night (29 June) at the popular music festival near Pilton, Somerset.
After completing her set, 27-year-old Ellie appeared to be a little overwhelmed: "I know you got me. What a crowd," she said. "So immense, too much to take."
Hours later, Ellie then posted a photo of McFly star Dougie proudly wearing a T-shirt with her face printed on it!
Ellie simply declared: "Found a fan."
It was a busy day for Dougie, who had earlier been performing with his McBusted bandmates at Chantry Park, Ipswich, before joining Ellie.
Ellie and Dougie fuelled romance rumours at the start of the year, and finally took their relationship public in May.
During the Fearne and… McBusted documentary on ITV2, Dougie opened up about his personal life, explaining that everything was "very good". Meanwhile, Ellie has described Dougie as a "very lovely human being."
Ellie recently opened up about the difficulties of long-distance relationships, telling Self magazine: "It's not fun, but we can make it work. Love is beyond everything, beyond the universe".
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Watch Ellie's video for 'Beating Heart' below: