British pop singer Adele has written a new song about unrequited love. It's her first single in three years.

She teased the new tune, which is about missing an old flame, in a commercial that aired on Sunday night's UK's "X Factor."

Her last single "Sky Fall" was released in 2012.

The unnamed song is reportedly from her new album "25" out Nov. 20.

Rumor has it the album will feature collaborations with Pharrell Williams, Max Martin and One Republic's Ryan Tedder.

Adele won six Grammy awards for her last record "21", which was released in 2011.