Rehab star Amy is all smiles after getting her teeth fixed ahead of Grammy performance

Despite the star's changing luck, she did not be perform live at last night's celebrations.

Instead, the 24-year-old, whose album Back to Black has been nominated for Grammys in six categories, sang via a satellite link from London.

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She had previously been denied entry to the US but stayed in the UK to focus on her recovery as she is weaned off drugs – and her sparkly new teeth.

Emerging from a second visit to a London dentist on Saturday, Amy flashed a bright white smile to onlookers before being escorted by her father Mitch back to the centre she is receiving treatment in.

This is a far-cry from December when she was spotted with gaps in her mouth suggesting her teeth had fallen out.

A friend close to her admitted at the time: "She has one missing from the front of her mouth, and another one at the back which is less visible.

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"Her mouth is full of holes and she is desperately worried she is going to lose more. She has actually pulled a tooth out herself, which is absolutely disgusting."

"Her gums are always red and sore as a result of it and some of the teeth are loosening."

Rehab appears to be agreeing with Amy in more ways than one.

The singer seemed focused, was well-dressed and had even painted her nails red for the occasion.

But even without Winehouse performing at the event, there were plenty of stars at the event.

Whitney Houston's appearance at Clive Davis' celebrity-soaked, pre-Grammy concert party fuelled speculation she would be among the night's performers.

But the diva, who is working on her comeback album, didn't get on stage.

Grammy-nominees who sang at the VIP event included Alicia Keys, the Foo Fighters, Daughtry, Leona Lewis and Akon were among the Grammy-nominees who sang at the VIP event.

Hollywood's A-list were out in force with Janet Jackson, new mum Nicole Richie and boyfriend Joel Madden and Richie's father, Lionel. Ashlee Simpson and boyfriend Pete Wentz were cosied up together and Usher, Rihanna and Chris Brown were also at the event.

Daughtry's two-song set included guitarist Slash and Nickelback lead singer Chad Kroeger.

Lead singer Daughtry said performing at the event, perhaps the music industry's most coveted invite, is an enviable position to be in.

"I was here last year, and I had to sit in the audience, and it sucks watching everyone else perform."