Miley Cyrus: I can keep secrets

Miley Cyrus is the "biggest" at keeping secrets.

The singer was recently seen leaving Justin Bieber's recording studio, sparking rumours that the stars would be collaborating in the future.

Miley coyly addressed the speculation at last night's Billboard Music Awards in Las Vegas.

"I know pictures are flying around," Miley told E! Online. "You guys will have to wait and see. I'm the biggest at top secrets. I've had this single [We Can't Stop, to be released June 3] ready for about a year, and I've had to keep my lips sealed and just not saying anything. So you'll see."

While she's keeping schtum about a possible Justin collaboration, Miley was keen to discuss her upcoming single.

The star says We Can't Stop is for and about her fans.

"They really believed in me the whole time," she explained. "I feel like this song really is for them and how I feel - that I can't stop and I'm going to be who I am and they should be who they are and that they can't stop and no one can stop us. It really is an inspiring song for my fans. We don't care; we can do what we want."

Miley's relationship with fiancé Liam Hemsworth has been the subject of numerous rumours, following claims the stars are going through a rocky patch.

The petite singer proudly showed off her engagement ring last night, while Liam is fulfilling work obligations at the Cannes Film Festival.

"I'm riding solo tonight," Miley smiled.