Newly single superstar, Justin Timberlake, may be in a film called 'Friends With Benefits' alongside Hollywood stunner Mila Kunis, but he doesn't think that pals should cross that line because it often "becomes a bad idea really fast".

The 'SexyBack' singer, who plays the lead in the new film, sat down with Ellen DeGeneres to discuss his role, but ended up revealing more than his experience of making the motion picture. When asked if he thinks sleeping with friends can ever work, Timberlake replied:

"It's a really good idea until it becomes a bad idea, and it probably becomes a bad idea really fast...I'd assume."

"I think everybody can probably agree with us when we say that at some point, if you're going to be intimate with someone at some point, someone is going to feel something."

The full interview airs in the U.S today, April 28, but you can watch a clip from the entertaining segment here: