Miley Cyrus and Liam Hemsworth are probably one of our all-time favorite Hollywood couples. The charming Australian actor and weed-loving American singer may seem like an unlikely duo at first glance, but time and time again they've proven themselves to be an adorable match. And after years of (on-off) dating, the couple finally confirmed their engagement in October. Now, they're officially celebrating their first Valentine's Day together as fiancés.