VIDEO: Adam Lambert, Nicole Scherzinger, Katy Perry and More Sing 'Imagine' for UNICEF

In celebration of the 25th anniversary of United Nations' Convention on the Rights of the Child, UNICEF has joined forces with Yoko Ono and David Guetta to create a starry cover of John Lennon's "Imagine" as part of the #IMAGINE Project. Watch the video, featuring stage stars Adam Lambert and Nicole Scherzinger alongside music giants Katy Perry, Will.i.am and more!

The stars' individual recordings will be gathered and released in a "world version" of "Imagine" on January 1.