Chris Hemsworth has fuelled speculation that Liam Hemsworth is engaged to Miley Cyrus.

Elsa Pataky and Chris Hemsworth

Elsa Pataky and Chris Hemsworth

Whilst the 'Thor' star wouldn't say specifically if the couple had rekindled their romance, he insisted his sibling is "smart and happy".

He said: "I'm happy if he's happy, whatever he's doing in life. I can't confirm any of that but, you know, he's smart [and] he's happy."

Meanwhile, when it comes to his own relationship, the 32-year-old actor - who has been married to Elsa Pataky since 2010 - is looking forward to Valentine's Day next month but remained tight lipped about his plans.

When pressed, he said: "I can't tell you. Can't give it away, but it's going to be special.

"I like to think [I'm romantic] but I can't say I succeed all the time but it's the thought that counts."

Chris and his family, which also includes their children, three-year-old India Rose and 22-month-old twins Tristan and Sasha, have recently made the move back to his native Australia and are loving the relaxed atmosphere.

He told Entertainment Tonight: "They love it! Where we were in California, and being a part of the big city like that, [it was] very different to where we live in Australia. To be able to walk straight down to the beach and see nobody [is] something that they quickly acknowledge and appreciate. My wife loves it [too]."