Australian model Lara Bingle has fuelled speculation she and her actor partner Sam Worthington are expecting their first child by sharing telling photos on Instagram.com.

The notoriously-private couple has yet to address rumours suggesting Bingle is pregnant, but she has been hiding her figure in baggy clothing for several months and has refrained from posting full-body shots of herself in a bikini, which she had previously been known to do.

Now Bingle has only teased fans further by uploading underwater pictures of herself in a two-piece on Monday (26Jan15), with her enlarged breasts almost spilling out of her top.

The images feature a blurred effect, but one photo clearly shows the bulge of her growing belly.

According to reports, the snaps were taken at the Parker Hotel in Palm Springs, California, where an onlooker tells the Sydney Daily Telegraph, "She is glowing. She is definitely pregnant. She was showing off her belly in a bikini and seemed really happy."

Bingle and Avatar star Worthington have been dating since 2013 and reportedly wed in a secret ceremony last year (14).