Ariana Grande comforted by Mac Miller as she lands in U.S. after Manchester concert bombing

Ariana Grande is back in the United States and has reunited with boyfriend Mac Miller following the concert attack at her show in Manchester on Monday night.

The 23-year-old singer returned to Boca Raton, Florida, on Tuesday, where Grande was spotted with 25-year-old Miller and her mother at the airport.

"When Ariana got off the plane, Mac greeted her on the tarmac with a long hug followed by a kiss," a source tells E! News. "Mac also gave Ariana's mom a hug. It was a very emotional reunion and they stood talking for a minute before getting into the car."

NEWS: Ariana Grande Says She's 'Broken' After 22 Die in Post-Concert Attack -- 'I Don't Have Words'

A source close to Grande tells ET that the former Nickelodeon star is "an absolute wreck" following the suicide bombing that left 22 people dead.

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Timeline of the Manchester Arena attack
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Timeline of the Manchester Arena attack
Police vehicles and a police officer are seen outside the Manchester Arena, where U.S. singer Ariana Grande had been performing in Manchester, northern England, Britain May 22, 2017. REUTERS/Jon Super
Police responded to reports of an incident at Manchester Arena. Please stay away from the area. More details to follow....
#arianagrande concert in Manchester where people were running to get safe after an explosion took place, the concert goers reportedly heard two loud booms and there may have been casualties #gossiptwins
An ambulance drives away from the Manchester Arena, where U.S. singer Ariana Grande had been performing, in Manchester, northern England, Britain, May 23, 2017. REUTERS/Andrew Yates
Emergency services responding to serious incident at Manchester Arena. Avoid the area. More details will follow as soon as available
Two women wrapped in thermal blankets stand near the Manchester Arena, where U.S. singer Ariana Grande had been performing, in Manchester, northern England, Britain, May 23, 2017. REUTERS/Andrew Yates
Pictures of the injured beginning to come out of Manchester (credit: Joel Goodman) https://t.co/9LebrHAmby
MANCHESTER, ENGLAND - A person is wheeled away on a stretcher at Victoria Railway Station close to the Manchester Arena on May 23, 2017 in Manchester, England. There have been reports of explosions at Manchester Arena where Ariana Grande had performed this evening. Greater Manchester Police have have confirmed there are fatalities and warned people to stay away from the area. (Photo by Dave Thompson/Getty Images)
Police statement on incident at Manchester Arena https://t.co/gaKASukx9a
Due to the incident in Manchester, please only call us for life threatening emergencies at this time. Thank you.
MANCHESTER, ENGLAND - Emergency services arrive close to the Manchester Arena on May 23, 2017 in Manchester, England. There have been reports of explosions at Manchester Arena where Ariana Grande had performed this evening. Greater Manchester Police have have confirmed there are fatalities and warned people to stay away from the area. (Photo by Dave Thompson/Getty Images)
MANCHESTER, ENGLAND - Members of the public receive treatment from emergency service staff at Victoria Railway Station close to the Manchester Arena on May 23, 2017 in Manchester, England. There have been reports of explosions at Manchester Arena where Ariana Grande had performed this evening. Greater Manchester Police have have confirmed there are fatalities and warned people to stay away from the area. (Photo by Dave Thompson/Getty Images)
Latest statement on incident at Manchester Arena https://t.co/BEpLOan3dY
MANCHESTER, ENGLAND - MAY 23: Police corden off an area close to the Box Office entrance to the Manchester Arena on May 23, 2017 in Manchester, England. An explosion occurred at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed. Greater Manchester Police have confirmed 19 fatalities and at least 50 injured. (Photo by Dave Thompson/Getty Images)
MANCHESTER, ENGLAND - MAY 23: Members of the public are escorted from the Manchester Arena on May 23, 2017 in Manchester, England. There have been reports of explosions at Manchester Arena where Ariana Grande had performed this evening. Greater Manchester Police have have confirmed there are fatalities and warned people to stay away from the area. (Photo by Dave Thompson/Getty Images)
MANCHESTER, ENGLAND - MAY 23: Police escort members of the public from the Manchester Arena on May 23, 2017 in Manchester, England. There have been reports of explosions at Manchester Arena where Ariana Grande had performed this evening. Greater Manchester Police have have confirmed there are fatalities and warned people to stay away from the area. (Photo by Christopher Furlong/Getty Images)
#Manchester explosion @gmpolice statement: 19 dead and around 50 injured in the incident that's currently being tre… https://t.co/LmzzMsc5CV
Latest statement on incident at Manchester Arena @CCIanHopkins https://t.co/GEABqAk5rr
NWAS has taken 59 casualties from the Manchester Arena incident to various hospitals & treated a number of walking wounded on scene
Forensics investigators work at the entrance to the Manchester Arena, Britain May 23, 2017. REUTERS/Andrew Yates
Ian Hopkins, Chief Constable of Greater Manchester Police, addresses the media near the Manchester Arena, where U.S. singer Ariana Grande had been performing in Manchester, northern England, Britain May 23, 2017. REUTERS/Jon Super
A youngster wearing a t-shirt showing U.S. singer Ariana Grande talks to the media near the Manchester Arena in Manchester, Britain May 23, 2017. REUTERS/Andrew Yates
Britain's Home Secretary Amber Rudd arrives in Downing Street for an emergency cabinet meeting in London, May 23, 2017. REUTERS/Toby Melville
LONDON, UNITED KINGDOM - MAY 23: Prime Minister Theresa May delivers a statement outside No 10 Downing Street following the terror attacks at Manchester Arena on May 23, 2017 in London, England. A large explosion was reported at the end of a concert by American singer Ariana Grande. So far, police have confirmed 22 dead and over fifty injured in the explosion, now thought to be terrorist-related. PHOTOGRAPH BY Amer Ghazzal / Barcroft Images London-T:+44 207 033 1031 E:hello@barcroftmedia.com - New York-T:+1 212 796 2458 E:hello@barcroftusa.com - New Delhi-T:+91 11 4053 2429 E:hello@barcroftindia.com www.barcroftimages.com (Photo credit should read Amer Ghazzal / Barcroft Images / Barcroft Media via Getty Images)
At the request of @JunckerEU, flags at half-mast in @EU_Commission in solidarity with the British people… https://t.co/AHKQTbW2oY
People rush out of the Arndale shopping centre as it is evacuated in Manchester, Britain May 23, 2017. REUTERS/Darren Staples
Police say it's a false alarm sparked by someone panicking unnecessarily. Outbreaks like this often happen in wake of a terror attack.
#Breaking Man, 23, arrested in connection with Manchester Arena bomb attack, @gmpolice say https://t.co/Y6On1vMA4R
An armed police officer stands outside a residential property near to where a man was arrested in the Chorlton area of Manchester, Britain May 23, 2017. REUTERS/Stefan Wermuth
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"She cares more about her fans than anything," the source says.

Grande tweeted about the attack on Monday. "Broken," she wrote. "From the bottom of my heart, I am so, so sorry. I don't have words."

CBS This Morning's Gayle King spoke off-camera with Grande's manager, Scooter Braun, at 1:30 a.m. on Tuesday about how the singer is doing. Braun said that Grande is "not good at all," and is "hysterical" and "devastated" over the news.

WATCH: Man, 23, Arrested in Relation to Ariana Grande Manchester Concert Bombing

Meanwhile, another source close to Grande tells ET that "the singer has not made a decision to cancel the remainder of her tour."

"Her team is continuing to assess the situation before they decide how to move forward, " the source says, adding, "their focus is on the victims and their families."

Georgina Callander, an 18-year-old college student, was one of the first victims confirmed dead from the attack. Watch the video below for more on Callander's special relationship with Grande.

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