Two weeks ago Miley Cyrus said yes to a proposal from Liam Hensworth. Now reumours are abound that the pop star is already cheating on her fiance.

The “Party in the U.S.A” singer was photographed in a Miami pool with a mystery man — and Hemsworth, 22, was nowhere in sight.

According to Celebuzz the mystery man was Cheyne Thomas – Miley’s BFF

Related: Click Here To See Miley’s Rock Of A Ring

“Chyene is Miley’s constant companion,” a source told Celebuzz.

“They are always together, shopping around her home in Studio City, Calif., or hitting the exclusive club Beacher’s Madhouse inside the Roosevelt Hotel in Hollywood.”

Her rep also shot down the rumors, saying, “There’s no story there.”

Cyrus took to twitter to slam the rumour as well.

“@tishcyrus I love my fiancé & he loves me,” she tweeted to her mom. “All the rest is bull sh–. We get to live a life of happiness no one can take that away from us!”

Miley Cyrus Cheat Report Not True Claims Couple

Miley Cyrus Cheat Report Not True Claims Couple