Songstress Miley Cyrus has slammed claims by US blogger Perez Hilton that she has cheated on fiancé Liam Hemsworth.

The star took to Twitter to blast Hilton for insinuating that she had been seeing Gossip Girl actor Ed Westwick.

Berating Hilton for posting the speculation on his website, the 20-year-old star wrote: "Perez Hilton hope you find love one day but can you not f**k with mine. I've never been with Ed W in my life. I was at the studio last night working on my record and never left with anyone other than my assistant. What happened to your big enlightenment...

"What happened to your promise to spread love not lies, and to be a decent human being with values and morals??? Dude u ask for people to respect you and your relationships I demand the same thing.

"Perez Hilton you're the first one to write about my engagement and my wedding and how happy u r for me and the first to try to tear my life. Respect, love & compassion are mandatory."

Cyrus then added: "Hope this message finds you happy and healthy... Feel free to ask me whatever u want but I can't tolerate lies. Thanks for understand. Blessings x (sic)."

The star has since deleted the tweets.