James Corden's upcoming guest on his popular Late Late Show segment, Carpool Karaoke, is by far the most mysterious.
CBS recently announced Sia will be the next to appear on it, on Monday, hours after the 2016 Grammys. The pop singer is known for being camera-shy and tends to hide her face behind wigs while performing.
"It could be anyone," Corden told E!'s Ryan Seacrest on the red carpet at the Grammys, regarding her Carpool Karaoke appearance. "It's just a chin really. I hope it's Sia. We're telling everyone it is."
The talk show host added that he hopes to recruit more celebs at the Grammys to appear on his show and is set to head there for a taping while the ceremony is still in progress.
Corden, a British actor, began hosting The Late Late Show last year, taking over for Craig Ferguson.
He recently revealed he was reluctant to accept the job and even turned it down twice.
Check out our coverage of everything Grammys.
Watch E!'s live 2016 Grammys red carpet coverage starting at 4 p.m. ET/1 p.m. PT on Monday, February 15th