Miley Cyrus needs to keep a watchful eye on new boyfriend Justin Gaston after Selena Gomez confessed that she thinks he's hot.

Having already dated one Miley ex (Nick Jonas), Selena seems to have taken a fancy to the Hannah Montana star's new beau.

But the teenager dismisses the notion of any rivalry between the Disney starlets, insisting she is happy for them both.
 
She tells US Weekly, "I think she's really sweet, and I think that he's really cute, too.

"I wish them all the luck."