Oh no! Patrick Schwarzenegger has allegedly cheated on girlfriend Miley Cyrus. The speculations started after photos of him getting intimate with a mystery brunette in Cabo San Lucas, Mexico circulated online.

Schwarzenegger and Cyrus have been dating for five months now, but after the release of the intimate photos, a breakup might be on the horizon. According to Daily Mail, Patrick and his alleged date were spotted sharing an intimate embrace, dancing around and walking hand-in-hand at a beach.

Though Miley Cyrus has not reacted on the issue yet, Hollywood Life revealed the "Bangerz" singer may have been upset after learning that her 21-year-old boyfriend got intimate with another girl during a University of Southern California (USC) spring break party at the Mango Deck Restaurant and Bar in Cabo.

The cheating rumors even became more controversial when Patrick was seen doing body shots off bikini-clad girls in some of the photos. And it was revealed that the mystery woman in the photos was apparently Schwarzenegger's friend from the Kappa Kappa Gamma sorority.

However, TMZ insinuated that the word "friend" is not a suitable description to the mystery woman seen in the controversial photos because "friends don't usually do body shots off one another."

Meanwhile, in a series of Twitter messages posted Monday afternoon, Cyrus' beau promptly denied the cheating controversy.

"Omg. It's one of my best friend's girlfriend...," he tweeted. It was then followed by another tweet, "Would NEVER do anything against my GF... Girls have guy friends and guys have friends that are girls..."

Cyrus, on the other hand, has remained silent amid her boyfriend's alleged two-timing scandal. But a Hollywood Life source exclusively said that the "We Can't Stop" singer was utterly devastated and that she felt her beau disrespected her as well as their relationship.

Until now, Cyrus hasn't directly commented about Schwarzenegger's flirty behavior in Cabo. Us Weekly shared the 22-year-old hitmaker did not even bother to mention her boyfriend's tryst on her Instagram account on Monday. Instead, she shared a cryptic message.

"Don't you ever let someone treat you like a yellow Starburst. You are a pink Starburst," her Instagram post read.

So, do you think Patrick Schwarzenegger and Miley Cyrus are headed to splitsville? For Patrick's spring break photos, click here.