Rebel Wilson Vamps in Yellow, Marking 'Hottest Day of the Year'

Rebel Wilson has not been shy about proclaiming 2020 her year to slim down to a goal weight of 165 lbs. — and she's already seeing eye-popping results!

Posting on her Instagram and Instagram Stories over the weekend, the "Pitch Perfect" actor — who usually defaults to funny — looked seriously sexy in a canary-yellow dress she chose to wear to a belated celebration of the June 27 wedding of her close friends Carly Steel and Jacob Andreou.

Looking beautiful in the Wayne Cooper dress (and knowing it), Rebel offered several flirty poses, writing, "Hottest day of the year."

In makeup by Matthew Vanleeuwen and a summery pony by Robert Vetica, she smiled broadly amidst the small gathering's guests, offering congratulations to her "former thrupple." She was joking. We think.

Rebel is loving her new look so much she also posted arty photos of herself submerged in a pool, touting her "mermaid skills."

Earlier in the year, Wilson's trainer Jono Castano told Yahoo! Lifestyle she was attacking her goals with new approaches to exercise and eating. Castano stressed a sensible method, saying, "I'm all about balance, so with me, if you're going to have one drink, whatever it is, a chocolate, that's totally fine as long as it fits into your calorie count."