Good Genes! Elle Macpherson's Half-Sister Lizzie Is Gorgeous

Elle Macpherson, 51, took to Instagram to share a sweet snapshot with her half-sister, Lizzie, 34, during a visit to Australia this week.

In the pic, the stunning supermodel and her younger sis look like twins with their beautiful blonde hair and white tops.

"Sisters @lizzie_macpherson," she captioned the cute candid, adding a heart emoji.

Even though Elle is 15 years older, these ladies look like they're the same age. The blonde bombshell, who is known as The Body, credits clean eating and constant exercise for helping her maintain her youthful looks.

"Over the years my focus has changed – now I look after my body not so it looks good, but so I am healthy, strong, energized and happy," she recently told Hello!. "That's more important to me than the number on the scales. Plus, I have my children to keep up with. Life is busy and I don't want to miss a second."

"I try to follow a 'clean' diet – lots of leafy greens, salad, fruit and vegetables and clean, hormone-free protein like fish and chicken," she explained. "I like my protein powder mixed with almond milk – it's a great nutritious snack or a healthy meal replacement. It contains all nine essential amino acids, nutrients to balance blood sugar levels, fiber to keep you feeling full and B vitamins to help combat stress."

When it comes to staying toned, she maintains her killer bod with daily workouts.

"I make exercise part of my everyday life. I have a much simpler and gentler routine now," she said. "I prefer not to go to the gym; instead, I make sure I find at least 45 minutes in my day, usually for a sport outdoors, which is easy in Miami. I love to paddle board, surf, swim or waterski. My advice is to find 45 minutes to move – even something simple; walk the dog; leave the car and walk to work. I'm more likely to stay with it if it's something I love and that fits into my life."