Miley Cyrus suffers from a heart condition. The 16-year-old singer has tachycardia - meaning her heart rate exceeds the range of a normal resting rate - and admits she worries about the complaint when she performs live.

She says in her new autobiography 'Miles to Go': "The type of tachycardia I have isn't dangerous. It won't hurt me, but it does bother me. There is never a time onstage when I'm not thinking about my heart."

Emma Roberts no longer has a crush on Nick Jonas because he has made too many "rounds of Hollywood."

The 18-year-old actress used to have feelings for the 16-year-old Jonas Brothers singer - who has previously dated Miley Cyrus and Selena Gomez - but claims his busy love life has put her off.

Nick Jonas will only date girls who like his mother. The 16-year-old Jonas Brothers singer - who has previously romanced Miley Cyrus - is so close to his mom Denice he would never feel comfortable in a relationship with someone who didn't bond with her.

Asked to describe his dream girl, Nick replied: "Someone who's good to my mom, that's very important. And someone who has a good sense of humor."

The Jonas Brothers are obsessed with Rick Astley. The musical trio are big fans of the 80s British singer - who caused an upset by winning Best Act Ever at last year's MTV Europe Music Awards after becoming a YouTube sensation - and regularly cover his most famous hit.

Kevin said: "A big one for us that we sing all the time is Rick Astley's 'Never Gonna Give You Up.'"