Patrick Schwarzenegger Miley Cyrus
Patrick Schwarzenegger denies reports that he cheated on Miley CyrusGetty

American model and actor Patrick Schwarzenegger has slammed reports that he cheated on his girlfriend Miley Cyrus with a mystery brunette while partying in Cabo San Lucas, Mexico.

In the images published by TMZ, the 21-year-old son of Arnold Schwarzenegger and Maria Shriver was seen with his arms wrapped around the female friend, and even appeared to be taking body shots off the bikini clad woman.

Patrick took to his Twitter account to set the record straight.

Though the former Disney star has not directly addressed the situation, she shared an image of herself with close friend and assistant Cheyne Thomas, and gushed about their friendship.

Following weeks of speculation, Cyrus went public with her romance with Patrick during the USC Trojans football game against the California Golden Bears by putting on a passionate display.

Miley Cyrus kisses Patrick Schwarzenegger
Miley Cyrus (R) kisses Patrick Schwarzenegger during the game between the California Golden Bears and the USC Trojans at Los Angeles Memorial Coliseum on 13 November, 2014 in Los Angeles, CaliforniaGetty

Cyrus and Patrick kissed and cuddled in full view of hundreds of spectators at the Los Angeles Memorial Coliseum.