Watch Adele perform "Hello" live for first time

Adele's TV debut of her smash hit "Hello" will air as part of an hour-long BBC special on Nov. 20. But a teaser from the taped performance is now out -- and it's worth a viewing.

The 27-year-old British songstress both sounds and looks stunning in the snippet, released Friday by the BBC. It marks her first TV appearance since performing "Skyfall" during the 2013 Oscar ceremony.

"Hello" has become the first song to sell one million tracks in a week. The beautiful, heart-wrenching ballad also debuted at No. 1 on Billboard's Hot 100 chart. It's the first single from Adele's third album, "25," due Nov. 20.