The Australian model, who gave birth to son Flynn in January, said that she has been trying to get her "booty up" through yoga, Pilates and squats before returning to the catwalk at the Victoria's Secret Fashion Show next month.
Kerr told the Courier-Mail: "I do yoga. That's something I consistently do as well as Pilates. So I've been doing that for the past six months. But I've been doing more squats because you gotta get that booty up.
"You really can't hide anything when you're up there on that runway - you've got cameras coming at you from every angle. This is something I've always wanted to do."
Kerr will wear a $2.5 billion (£1.6 billion) 142 carat diamond bra at the event. Other models taking part in the show include Adriana Lima, Alessandra Ambrosio and Doutzen Kroes.
The star recently described husband Orlando Bloom as the "best father", adding: "I'm really lucky. He wants to do everything. He changes the diapers, we have family bath time. It's really nice."
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