Una headed to London's O2 Arena to see Ellie perform a string of her hits including 'Burn' and 'Anything Could Happen' in front of a sold out crowd on Sunday night (9 March).
Tweeting ahead of the concert, 32-year-old Una excitedly told fans: "Really looking forward to seeing @elliegoulding tonight at the O2! X."
Ellie's concert certainly pleased 'What About Us' singer Una, who was watching on from a private box. Grabbing a quick photo with Ellie after the show, Una said: "Amazing performance tonight."
Una wasn't the only celebrity at the gig, as model Cara Delevingne also watched on from the VIP area and was full of praise for Ellie.
Writing on Instagram, Cara told fans: "So proud of you @elliegoulding that was an incredible show! I love u! X."
Ellie, whose second studio album Halcyon is currently sitting at number two in the UK music charts, bared her flesh in a futuristic-style leotard with black boots.
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Watch Ellie's music video for 'Burn' below: