Chris unaware of Liam, Miley's romance

Actor Chris Hemsworth doesn't know whether his brother Liam Hemsworth has rekindled his engagement with former girlfriend Miley Cyrus.

The "Thor" actor has remained tight-lipped on rumours claiming his younger sibling is romancing the singer again, 16 months after they split up, and says he has no idea whether they have plans to get hitched, reports dailymail.co.uk.

When asked during an interview with an Australian radio station if the former couple are dating, Chris said: "Not that I know of mate."

Chris said he is always the last to find out the details when it comes to his brother's personal life.

He added as he broke out into a laugh: "I would find out through the press. I find out last most of the time."

Miley, 23, and Liam, 26, who met on the set of 2010 movie "The Last Song", have sparked speculation they're talking wedding bells again after the singer was spotted wearing a huge diamond sparkler on her ring finger.