Everett Collection / Rex USA 1 / 8
Everett Collection / Rex USA 1 / 8

Are Miley Cyrus and Patrick Schwarzenegger on the verge of a breakup?

Following pictures of Patrick embracing a bikini-clad woman and doing body shots off her during spring break in Cabo, Miley took off to Las Vegas over the weekend, tellingly solo. Clad in a sheer black minidress, the 22-year-old "Wrecking Ball" singer reportedly stayed mellow drinking Grey Goose vodka and Patron tequila with her group of friends at the h.wood Group's "Heart of Omnia" room inside Omnia on Saturday night, People reports.

PHOTOS: What Happened in Vegas?

The magazine also reports that, despite appearances, Miley is "super bummed" about Patrick's controversial photos -- but that hasn't slowed her down on Instagram. On Sunday, she posted a topless photo of herself wearing a colorful hat.

And now, Patrick may have even more pictures to explain. After identifying the woman with him in the initial photos as one of his best friends' girlfriends, TMZ released more spring break pictures of the handsome 21-year-old model, this time with his ex-girlfriend Taylor Burns. In the photos, Burns is seen getting close to Patrick, at one point rubbing suntan lotion on his back.

However, according to Patrick himself and JustJared, there was absolutely no cheating going on during spring break. In fact, Patrick reportedly "takes pride in being a great boyfriend."

"This whole thing has hit Patrick really hard because he was just on spring break and acting like a stupid frat boy," the outlet quotes a source. "He feels bad that it would affect his relationship but he 100 percent never cheated on Miley. He knows the pictures look bad but honestly, nothing happened."

"He's worked hard at his relationship with Miley," a second source adds. "He provided her with a lot of stability and normalcy."

NEWS: Katherine Schwarzenegger Defends Patrick: 'Ever Heard of Spring Break?!'

Not surprisingly, the Miley and Patrick relationship drama has Smilers reacting strongly -- some have even disturbingly threatened to kill Patrick on social media.