Miley Cyrus stepped in for husband Liam Hemsworth after he was too ill to attend the premiere of his latest film.

Cyrus, who wed Hemsworth in a small ceremony in Tennessee in December, said her partner is still recovering for an illness which also caused him to miss the Grammys on Sunday.

Taking to Twitter at the premiere of Isn't It Romantic premiere on Monday, Cyrus said she was "proud to represent him and his incredible work".

The pop star wrote on Twitter: "So proud of my hunky hubby @liamhemsworth & his newest movie #IsntItRomantic He unfortunately wasn't able to attend due to health reasons... but he is recovering and taking this time to rest / heal.

"It's hard for entertainers to put themselves before the project but this time it was crucial .... I am proud to represent him and his incredible work. So happy to see him shining in this comedy! He is the funniest person I know , and the world now gets to see the Liam I wake up to every day.... luckiest."

Hemsworth apologised for his absence on Instagram, "blaming pretty annoying health stuff".

He added: "Lucky I have the best girl in the world to represent for me! Thanks for the support babe! I hope everyone enjoys the movie! It's a perfect Valentine's Day flick so if ya ain't got nothin better to do then go see it! Love to all!"

Isn't It Romantic also stars Australian actress Rebel Wilson and is due to stream on Netflix from February 28.

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