Serena strips down for bra maker, Berlei

World number one, Serena Williams is winning on the Australian tennis courts.

But on the side, she is busy doing business, Down Under.

In a recent photo shoot for Australian lingerie brand Berlei, Serena is seen showing her famous curves and incredibly toned figure as she strips down to model a variety of sports bras.

Behind-the-scenes images from the shoot are seen on Elle.com.au, and in an accompanying interview the fashion conscious star tells readers about how she works closely with brands Nike and Berlei to design her own on-court outfits.

Before this year's Australian Open, the 32-year-old took time out to star in a fashion campaign for the clothing company, for whom she's been a brand ambassador for two years.

Speaking about her favourite bra, she tells her fans: 'It's perfect for high-impact activity. 'It's so super comfy, even when you're working up a serious sweat.'