Miranda Kerr uses butt-lifts to look good in Victoria's Secret lingerie.

The Australian model - who has 23-month-old son Flynn with husband Orlando Bloom - regularly walks the runway in skimpy lingerie as one of the faces of the luxury brand and likes to do butt-lifts to keep her figure svelte.

She told London's Evening Standard newspaper: ''We are in our underwear a lot, shooting for Victoria's Secrets campaigns, so it's kind of a continual process of preparation.''

''The focus, for me, is always on lifting my butt, so I do a lot more exercise around that area, with squats and lunges, leg-lifts and resistance training with ankle weights.''

Miranda was back on the runway just three months after giving birth to Flynn in 2011, and says she even includes her son in her workouts.

She said: ''I like to do my workouts at home so that I can be with my son. Sometimes I will do squats while holding him as a weight. He likes that; he thinks it's funny.

''Something that I think is good for everyone, but particularly young mothers, is to put the music on that your child enjoys and dance around the house. You can really have a great workout.''