Date: December 2nd 2015 Event: Frank Sinatra's 100th Birthday All-Star Grammy Concert Location: The Wynn, Las Vegas
To celebrate what would have been Frank Sinatra's 100th birthday, a great number of musical talents were brought together to perform Sinatra songs. Among the Grammy stars were Tony Bennett, Carrie Underwood, and John Legend.
Lady Gaga was saved as the best for last where she performed "New York New York" to close the show.
For her performance, Lady Gaga wore a custom double lapel tuxedo by Brandon Maxwell, meaning it is not available to purchase.
Check out more photos from Lady Gaga's performance here.