The 38-year-old is mum to daughter Leni, seven, from a previous relationship, and Henry, five, Johan, four, and Lou, 22 months, with her husband Seal.
She told The Huffington Post: 'Having four children, with one having straight hair and three curly, it's a bit of a new world for me.'
The model added: 'I've let my boys' hair grow really really long, and just recently they asked me to cut off their beautiful hair! It was funny because it was definitely harder for ME in some ways, as I absolutely love their hair!
Klum admitted that her sons wanted much shorter hair and she got some celebrity inspiration.
She added: 'They wanted mohawks with special designs to them, so I asked Lamar Odom, who did his cool star-design buzz, and then contacted his stylist.
'He gave my kids these buzz cuts with amazing individual designs... great for the summer because they're COOL, in both senses of the word!'