Along with a bee emoji, which is a symbol of the North West England city, she wrote: "love u v much".
Twenty-three people including the attacker were killed in the terror attack at an Ariana Grande concert.
Meanwhile, Prince William remembered the 22 victims of the Manchester bombing by attending the Manchester Arena National Service of Commemoration at Manchester Cathedral, according to the reports.
The 24-year-old singer took to social media to send her love and warmth to the people in London through a series of tweets.
Prince William read from Corinthians during a service full of song and tribute to the victims and their families.
Paddy Power warns over British decision to cut betting machines stakes
Culture Secretary Matt Hancock described FOBTs as a "social blight" which "prey on some of the most vulnerable in society". Fellow gaming group 888 Holdings dropped 6 per cent, with GVC Holdings off 4 per cent and Playtech 2 per cent lower.
Thousands of people paused outside Manchester Cathedral at 2:30 p.m. for a minute of silence that was observed across the country, including in Parliament, where lawmakers paused their debates and fell still.
In an article for the Manchester Evening News, Theresa May said: "The targeting of the young and innocent as they enjoyed a carefree night out in the Manchester Arena on May 22, 2017 was an act of sickening cowardice".
"It was created to strike at the heart of our values and our way of life in one of our most vibrant cities, with the aim of breaking our resolve and dividing us".
The cathedral service was shown on a big screen in the city as well as in other cities across Britain, including York, Liverpool and Glasgow.
Twenty-two concertgoers were killed, and police say more than 800 people were left "with physical and deep psychological injuries".
David Sullivan says West Ham 'very close' to appointing new manager
However it serves to focus on Benitez's frustration that such a state of affairs has been talked about since final summer time. It's understood that Benitez would prefer to stay at Newcastle but wants assurances over his summer transfer budget.
The youngest person to die was just eight years old.
Later on thousands - many of them youngsters - gathered in the city centre for a "Manchester together" concert, with performances from local youth choirs, poetry and recorded messages of support from celebrities including former Manchester United star Ryan Giggs.
Bells were scheduled to ring out from the town hall at 10.31pm, marking the moment the attack took place.
Air Force apologizes for tone-deaf 'Yanny-Laurel' tweet
Pentagon social media accounts have sometimes been used to send strong, although usually more subtle, messages to USA adversaries. Laurel Halo, meanwhile, got defensive against those who weren't teaming on the side of her namesake.