Justin Trudeau accepts P.K. Subban's #CanadaCarols challenge

It's on.

Canada's prime minister has accepted a challenge from Montreal Canadiens' stardefencemanP.K.Subbanto sing a Christmas carol for children in hospitaland post it on Twitter.

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Subbanthrew the challenge his way on Thursday, via Twitter.

"Hey JustinTrudeau! You have great hair, but can you sing Jingle Bells?"Subbansaid in a tweet from inside the Bell Centre.

On Friday afternoon, the prime minister responded, saying he was going to make it a family affair.

"You're about to find out, P.K.Subban.Sophieand I are warming up as we speak," Trudeautweeted back.

Canadians immediately weighed in on social media.

The goal of the Subban-fronted campaign is to create a country-wide social media singalong to brighten up the holidays for kids at the Montreal Children's Hospital and other pediatrichospitals.

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Earlier this year, Subban's foundation pledged $10 million to the Montreal Children's,and the new hospital named its atrium in his honour.