The 'Rocket Man' singer spent two nights in intensive care after becoming "violently ill".
Tony Bennett and Lady Gaga have been confirmed to perform at the Grammy Awards 2015.
Crooner Tony Bennett and pop-turned-jazz singer Lady Gaga have been confirmed to perform at this year’s Grammy Award ceremony on February 08.
Bennett, 88 and Gaga, 28, released joint jazz album Cheek to Cheek last year, with the record up for a Grammy in the best pop album category.
It has also been revealed that Rihanna will debut her new single at the Grammys, with the help of collaborators Paul McCartney and Kanye West. The trio will perform her latest hit Four Five Seconds on the night.
"Throughout the years, the Grammy Awards has paired musical icons with new, upcoming artists to give fans remarkable performances that can only be seen on our stage," Recording Academy President and CEO Neil Portnow explained in a statement. "This year is no different and, once again, promises to bring together unique musical worlds in innovative ways that blend genres and create new artistic boundaries."
Watch Bennett and Gaga perform their version of The Lady Is A Tramp: