Although the single was leaked several days ago, talented trio Piggy Doll's new digital single, "What is Love" is now officially available for fans to purchase at major online music retailers. In contrast to their upbeat debut song, "Trend" and happy-go-lucky follow-up track "Know Her", their new song slows things down and showcases the groups enviable vocal skills. �Featuring rapper Simon D of hip-hop duo Supreme Team, the song tells of the emotional turmoil when a relationship ends. Check out the heartfelt track below: Thanks to Jae for the tip!