Ellie Goulding revealed it had been a "crazy journey" as she returned to headline the iTunes Festival for the third time.
The 26 year-old singer, who had her first number one single with Burn, previously played the event at Camden's Roundhouse in 2010 and 2012.
"It's been a crazy journey over the past four years. Thank you!" she told the screaming crowds as she ended her set.
Ellie, who will hit the road for a UK tour in October, kicked off the night with Don't Say A Word and sang hits like Anything Could Happen, Lights, Burn and I Need Your Love.
"I think we should get moving. Let's share the sweaty love - oh, that sounds really bad!" she said, laughing.
She also sang her cover of Elton John's Your Song, which is by "a really great man that I really respect so much". Before playing Holding Up, she said: "This song we played last time we were here. This is crazy. It's been a year, it's gone really, really quickly!"
She revealed she was pleased to be back in the UK: "It's really nice to be back. I've been away in America for so long, it's so good to be back."
After the show, she tweeted: "What an incredible show.. Was a real moment for me x."
Californian girl group Haim - made up of sisters Este, Danielle and Alana Haim - performed at the festival on September 21, ahead of the release of their debut album Days Are Gone on September 30.