Sunday's concert raised money for victims of the suicide bombing that struck at Grande's show on May 22.
Before her performance, she and her dancers held hands in solidarity.
Other performers will include Pharrell Williams, Usher, the Black Eyed Peas, Robbie Williams and Niall Horan.
Gallagher, formerly of Oasis, earned loud cheers from the audience as he emerged in his home town in surprise form. Police officers danced, medics sang along and one lively steward encouraged the crowd to clap and dance.
Many in the crowd were in tears as Grande sang with a choir from Parrs Wood High School.
"So that means that we had a totally different show planned and we had a rehearsal yesterday where we changed everything and this evening has been so light and so filled with fun and love and bright energy and I want to thank you for that". I love you so so much. "She would've wanted to hear the hits".
It wasn't just the fans who got into the spirit of the show.
"(God) loves you and he's here for you. 'I swear she wasn't wearing that ring just a moment ago!' Another said: 'I don't want to take away from the incredible event we've just witnessed... but is Ariana engaged? "And unified. I think the kind of love you're displaying is the kind of medicine the world needs now". Justin Bieber and Coldplay are also scheduled to perform.
"I don't want to feel or hear or see any fear in this building", USA singer Pharrell Williams told the crowd as he led them in a rendition of his hit single "Happy". "All we feel here tonight is love, resilience, positivity", said Pharrel Williams, who performed alongside Miley Cyrus.
"Our thoughts are with everyone who has been affected by this", singer Gary Barlow said.
A further terrorist attack in London on Saturday night had led to speculation that Ariana may pull the plug on the concert, but the singer opted to stand strong in the face of the attackers.
US President Donald Trump came under fire on Sunday for criticising London's mayor in the aftermath of attacks in the city that killed seven people and injured at least 48 others. Authorities have said the attack started with a van plowing into pedestrians and then involved three men using large knives to attack people in bars and restaurants at a nearby market.
Grande was all about love during the concert as her 25-year-old boyfriend Miller joined her on stage.
The watchOS 4 will be available as a free update to the Apple Watches that can be paired with iPhone 5s and later on iOS 11 . There is also a Activity coaching, GymKit for Apple Watch to communicate with Gym equipments and a new music experince.
These short films would be heavily monster focused, and the studio would serve as a testing ground for potential full-scale films. In the wake of his scrapped Alien sequel , Blomkamp has been teasing his new project, Oats Studios , for some time.
Howard said he wasn't sure what caused him to hit the wall, whether a part broke in the suspension or something else. Takuma Sato , who won this year's race, became the first Japanese driver to win the Indy 500, The Drive reported .
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The drivers of the van then ran out with knives, attacking people on the street and in businesses in nearby Borough Market . The U.K. has already been reeling from the May 22 attack in Manchester at a Ariana Grande concert that killed 22 people.
Stuart Shapiro, who works on computer simulations of gravitational waves at the University of IL at Urbana-Champaign, agrees. The second detection was made in December 2015 , and the third detection, called GW170104, was made on January 4, 2017.
The minister raised the possibility of limiting airstrikes if government troops converge within cities controlled by militants. Fighters loyal to him surprised government forces with their firepower, fending off air strikes and house-to-house searches.
She came closest in 2002 when she was beaten in the final by her younger sister, as she was at both Wimbledon and the U.S. Kvitova double faulted into the net on match point and spiked her Wilson racquet in frustration at that transgression.
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Czech second seed Karolina Pliskova reached the French Open second round on Monday with a 7-5, 6-2 win overn China's Zheng Saisai. KEY STATISTIC I: 9 - Record number of French Open titles for Rafael Nadal , who is favored by many to collect No. 10 this year.
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