What's up may refer to:
What's Up! is a Swedish boyband established in 2007 and was originally composed of Eric Saade, Robin Stjernberg, Luwdig "Ludde" Keijser and Johan Yngvesson. When Saade left the band to pursue a solo career, he was replaced by Johannes Magnusson.
The band What's Up! was formed based on a competition that attracted hundreds of applicants. 15 finalists competed in an event held at the Globe theater and as a result the four original members were picked. They all had experience in earlier musical events. Eric Saade from Kattarp had won on the Swedish music contest Joker (now Popkorn). Robin Stjernberg from Hässleholm had been a winner in the Sommarchansen in Malmö in 2006, Luwdig "Ludde" Keijser from Enköping had competed in Lilla Melodifestivalen and Johan Yngvesson from Vetlanda had appeared in Super Trouper television series.
The newly formed band toured Sweden starting Spring 2008 and released an album entitled In Pose. It stayed one week in the Swedish Albums Chart at #40. They had two relatively successful singles from the album. "Go Girl!" in May 2007 that peaked at #5 in the Swedish Singles Chart and "If I Told You Once" in March 2008 reaching #16.