Mariah Carey, Prince Royce, Darius Rucker, Rockettes added to NBC's 'Christmas in Rockefeller Center' special

Mariah Carey, Prince Royce, Darius Rucker and the Rockettes will join the star-studded holiday special, "Christmas in Rockefeller Center," airing live from Rockefeller Center in New York City Wednesday, Dec. 3 (8-9 p.m. ET). Carey will open the holiday program with a special performance of her No. 1 smash hit "All I Want For Christmas is You."

The show will be hosted by "Today" anchors Matt Lauer, Savannah Guthrie, Al Roker and Natalie Morales, and will feature previously announced performances from Lady Gaga & Tony Bennett, Cyndi Lauper featuring Billy Porter, Seth MacFarlane featuring Sara Bareilles, Idina Menzel, Pentatonix, LeAnn Rimes and Trisha Yearwood.

The 82nd annual holiday event will feature an 85-foot tall Norway spruce from Hemlock Township, Pennsylvania. It is approximately 90 years old and weighs 13 tons.

Once again, "Green is Universal" - NBCUniversal's sustainability initiative - and the Arbor Day Foundation will kick off their tree planting campaign, "Share a Tree," during the "Christmas in Rockefeller Center" broadcast. Viewers will be asked to participate by tweeting #shareatree, or visiting greenisuniversal.com. For every tweet, "Like," share or comment, the Arbor Day Foundation will plant one tree, up to 1 million.

This year, when visitors go to http://www.greenisuniversal.com/, they'll come across a digital forest with hand-drawn trees from NBCU talent, including Roker, Morales, Alison Sweeney, Andy Cohen, Jim Cramer and many more. NBCU fans are invited to decorate and share their own digital trees, plus share NBC talents' customized trees. Each tree decorated, plus every "Like," share, retweet and comment, will plant a tree. All the social actions will also trigger donations from NBCU to Arbor Day, up to $25,000.