Now, paparazzi photos have emerged of the slimmed-down Pitch Perfect star in a black one piece, showcasing the full extent of her 20kg weight loss.

Stepping out on the beach in Cabo San Lucas in a chic bathing suit paired with a large hat and sunglasses, her millionaire boyfriend by her side, the 40-year-old actress looked incredible.

RELATED: Rebel Wilson nears weight loss goal: ‘Call me Fit Amy’

Meanwhile, 29-year-old Busch, who is rumoured to be worth more than $140 million, donned animal print board shorts and sunnies, his toned bod on display.

As documented on the star’s Instagram, the couple jetted to Mexico for a beach holiday over the weekend, with Rebel uploading a number of shirtless photos of Busch to her profile, gushing over her new