She will perform The Place Where Lost Things Go from the sequel to the well-loved film.
The 36-year-old was attacked in January.
The movie's stars have announced the end of filming.
The singer and actress is believed to have more than a dozen tattoos.
Tolkien will be released in the UK in May.
The singer plays himself in the new film penned by Richard Curtis.
The speeches from the four winners will be shown later on in the broadcast.
The pair proclaimed their support for the LGBT community on the red carpet before Sunday's awards ceremony.
They will take to the stage at the ceremony in Los Angeles on February 24.
Dexter Fletcher said at the end of the day 'people vote with their tickets'.
The star made her name on Broadway.
Finney played James Bond's gamekeeper Kincade in Skyfall.
The veteran actor has died aged 82.
The eight-minute film follows Purl, a ball of yarn, as she navigates a new job in a male environment.
The actress took over from Stephen Fry last year.
The actor had argued his presence would amplify negative publicity.
The Absolutely Fabulous star praised her screen mother.
The actor shared a sweet video of his mum bursting into tears.
The actress has died aged 93.
The star of Terry And June 'passed away peacefully', her agent confirmed.
The director has been honoured on the diplomatic service and overseas list.
Prosecutors asked the judge to deny the motion. The judge did not immediately rule.
The Hollywood star is to work with the BBC World Service as a producer for a series of educational shows for children.
The actress received the honour at Buckingham Palace earlier this month.
The Hollywood star is the mother of six children - three from Cambodia, Ethiopia and Vietnam, as well as her biological children.