Liam Hemsworth: Cheating on Miley with Yolanda Vendy?

Sources say Miley Cyrus got back together with Liam Hemsworth because she was seeking a sense of stability in the face of her parents' divorce.

So we wonder how the singer will take this news: the Australian actor was spotted Down Under this weekend, attending the Myer Derby After Dark Party at a nightclub - and he wasn't alone.

Part-time model Yolanda Vendy met Liam that day and was by his side all night, onlookers confirm, as the blonde was asked if she and Hemsworth were friends. Her mysterious response? If that's what you want to call it.

Vendy (pictured, middle) and Hemsworth reportedly spent most of the night whispering to each other and were two of the last guests to leave the festivities.

This doesn't mean Liam was unfaithful to Miley, of course. For her sake, considering all she's going through in her personal life, we hope he's remaining loyal. But Hemsworth should know that perception is often reality and should be taking extreme measures these days to avoid circumstances such as this.