A representative for Liam Hemsworth has denied tabloid reports suggesting the actor has been cheating on his fiancee Miley Cyrus with Mad Men's January Jones.

The Hunger Games hunk was said to have been hooking up and sending sexually explicit text messages to the actress behind his pop star partner's back - but a spokesperson insists the rumours are false.

Hemsworth's spokesperson tells PerezHilton.com, "The story of Liam Hemsworth and January Jones is entirely fabricated by Us Weekly. There is no truth whatsoever to this tabloid fiction."

Hemsworth became engaged to Cyrus last year (12) but speculation about the state of their relationship went into overdrive in February (13) when he was photographed in a car with Jones.