the 29-year-old actress looked a sheer delight in the see-through strapless gown, which flashed the flesh. She showcased her striking figure in the mauve dress, which featured a substantial train.
The High School Musical alum wisely let the fussy garment stand-alone – adding no accessories.
The star also kept her glossy dark tresses neat and sleek, in a bob with a side parting, framing her pretty features.
The beauty added natural-looking makeup with a matching pink lip colour.
She was joined by long-term boyfriend Austin Butler at the swanky premiere, which took place at The Atrium at Westfield Century City.
The movie, which opens on Aug 8, is described as a hilarious and heartfelt ensemble comedy that follows the lives of multiple dog owners and their beloved fluffy pals around sunny Los Angeles.