Selena Gomez has "declined" to take part in Justin Bieber's upcoming roast.

A source told In Touch Weekly magazine: "Selena declined. Now that she's dating DJ Zedd, she thinks it would be incredibly disrespectful to him if she were to do it."

But the Canadian singer, who split from the brunette beauty in October after four years of on/off dating, is upset that she won't be among those poking fun at him during the TV special, which is being filmed on March 7.

The source said: "Justin is hurt. He really wanted her there. He's hoping he can change her mind."

But the 'Rudderless' actress has no plans to even watch the show when it is aired on Comedy Central on March 30.

The source added: "Selena is really happy right now."

Another insider recently claimed Justin is upset the 'Slow Down' hitmaker isn't pining over him.

The source said: "Seeing her happy with Zedd and the fact that she's not pining for him are bitter blows to his ego. Justin wants to have his fun, and know he has Selena in his back pocket whenever he needs her."