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FILE - In this Nov. 24, 2013 file photo, Justin Timberlake performs on stage at the American Music Awards at the Nokia Theatre L.A. Live in Los Angeles. Not a lot of fans knew who Macklemore & Ryan Lewis and Lorde were when last we gathered a year ago to celebrate music with the Grammy Awards nominations. Yet thanks to a series of inescapable and smart hits, these upstarts could very well muscle Timberlake, Taylor Swift and other Grammy favorites out of the way when nominees are announced Friday night, Dec. 6, 2013, in a television special broadcast live on CBS. (Photo by John Shearer/Invision/AP, File)
The first of Justin Timberlake's two concerts at Madison Square Garden has been postponed.
The singer posted on Twitter Wednesday that the postponement is due to health reasons. The show originally scheduled for Wednesday has been rescheduled for Friday.
Timberlake apologized on Twitter and said, "It kills me to have to do this. I hope to see you all on Friday."
On its website, MSG says ticketholders can get a refund if they want, starting Thursday morning.
The Thursday night performance in Timberlake's "The 20/20 Experience World Tour" is expected to take place as planned.
He'll then appear on the "Tonight Show Starring Jimmy Fallon" on Friday.