Cat Deeley and her husband Patrick Kielty are supporting Unicef's #HappyBlueYear campaign.
The new campaign aims to drive donations to the charity's winter appeal which focuses on the children whose lives have been affected by the ongoing conflict in Syria.
Unicef is encouraging the public to show their support for the campaign by taking part in their #HappyBlueYear video challenge by visiting the Unicef website or downloading the Happy Blue Year app.
People can then record a video of themselves singing along to Unicef's catchy tune with the specially created blue mouth.
Unicef UK Ambassador Cat - who is pregnant with her first child - said: "I love seeing in the New Year with my friends and family, watching the clock tick down to midnight and making our resolutions for the year ahead. This year I'm making a special resolution with Unicef to help children affected by the conflict in Syria. For too many children the New Year will sadly mean another year of conflict and fear. But together we can help make a difference and keep more Syrian children safe in 2016."
And her husband Patrick added: "I'm very excited for everything that 2016 has in store and New Year's Eve will be a time where I think about all my hopes for the year ahead. One big hope I have for 2016 is that by supporting Unicef's New Year's Resolution we can help more children whose lives have been devastated by the conflict in Syria. If that's not a resolution that's worth keeping then I don't know what is."
Catherine Cottrell, Executive Director of Fundraising at Unicef UK, added: "#HappyBlueYear is a hugely exciting campaign for Unicef and partnering with two iconic New Year's celebrations provides an amazing opportunity for us to reach millions of people across the country in order to help millions of children in danger around the world.
"New Year is often a time of reflection and so we wanted to create a campaign that allowed people to engage with the conflict in Syria but that encouraged donations to the cause by being fun and easy to participate in. This winter, the UK government will double any donation made, so even the smallest donations can make a huge difference."
To donate £3 text mouth to 70080 or go to unicef.org.uk to see the full video.