Blackpink's Rosé, Bruno Mars drop collab song 'APT.'

Rosé of Blackpink and Bruno Mars just released a fun new bop!

Their unexpected collaboration single "APT." was released on streaming platforms on Friday.

The accompanying music video, posted on Rosé's YouTube channel, showed the two musicians jamming and dancing to their song.

Earlier this week, Rosé and Bruno teased their collaboration by posting photos together on Instagram. The following day, they made the formal announcement.

Rosé will be releasing her debut solo album, "Rosie," in December. Her previous solo songs include "On The Ground" and "Gone."

Bruno, meanwhile, recently collaborated with Lady Gaga on the song "Die With a Smile." —JCB, GMA Integrated News