The Voice Australia coach Delta Goodrem has been sporting high neck and demure outfits recently on the show.
Later, Sonia was spotted sunbathing on a beach towel, with her impressively lean figure on display.
The blonde beauty had her hair out and straightened with a diamond chocker around her neck adding some glitz.
Keeping her long locks out and over her shoulders, the coach drew attention to her plunging neckline, which went right down to her navel.
Adding sex appeal to her look the Wings singer, who has two acts in the finals, opted for a smokey eye with a nude lip.