by Kev Geoghegan
Radio 1 music reporter
Amy Winehouse is "a lot healthier and a lot happier", one of her backing singers has exclusively told Newsbeat.
Ade (far-right) performs with Amy in London
Ade Omotayo performed with Amy in London on 10 February, as she picked up five Grammy awards for her album Back to Black.
Amy, who has been in rehab since last month, didn't travel to the ceremony in Los Angeles after initially being denied a US visa.
She was eventually granted one on 8 February but performed via a satellite link from London.
Ade, who tours regularly with Amy, told Newsbeat that the atmosphere at the Riverside studios was electric.
He said: "It was absolutely ecstatic really, it was almost like a football atmosphere. Every time she won, it was like a goal. You could hear loud cheers.
"It was family, friends, people from the record label, and wellwishers that were present and they were all in ecstacy.
"She was her usual funny self, making a joke a second.
"She's a lot healthier at the minute, she's a lot happier."
Amy won five out of her six nominations, including record of the year, best new artist, song of the year, pop vocal album and female pop vocal performance. She looked stunned at times when her name was called.
Kanye West was the night's other big winner
Omotayo said: "She was surprised to have won five. I'm sure she was hoping to win a couple.
"She was totally knocked back that Tony Bennett was calling her name and she kept calling to her dad because they're both huge fans of the crooners of that age."
He also revealed Amy and her band treated the audience to a few extra songs while the cameras were switched off.
He said: "We did run through some of her hits and a couple of covers here and there in 30 minute bursts.
"When we weren't watching the Grammys we would put on a performance.
"I don't think there were any nerves, it helped that we weren't at the Grammys and we were performing in front of an audience we knew."
Amy is still understood to be receiving treatment for drug addiction and Ade admits she shunned a big party following the night's successes, favouring a quieter celebration.
He said: "It was in the early hours, there was champagne everywhere but she went upstairs to play pool. We didnít leave until about 5 'o clock so we didnít really go out or anything.
"A lot of that takes away from the fact that she's such a wonderful person to be around. I couldn't praise her enough.
"She couldn't have thanked us more to be honest. We were really happy for her but she was also really happy for us.
"She's got a great heart."
The Brits organisers now say they are looking into whether Amy will be able to attend next week's awards on 20 February.