Katy Perry and Josh Groban
Jason Merritt/FilmMagic, Dimitrios Kambouris/WireImage
03/24/2009 at 06:00 PM EDT
Katy Perry and Josh Groban may sound like a perfect couple, but the two singers are not romantically involved, according to his rep.
"Josh and Katy are very close friends and hang out, but they are not a couple," Groban's rep, Luke Burland, tells PEOPLE in response to rumors of a relationship between the two.
Perry, who split with
Travis McCoy in January, is currently touring her One of the Boys
record. Groban, who is working on a new album, attended her Los Angeles show