Supermodel Miranda Kerr has opened up on life with her "very traditional" partner, saying she would not have another child until the pair get married.

During an interview to promote her latest collaboration with US-label Mother, the former Victoria's Secret angel opened up about her relationship with Snapchat billionaire Evan Spiegel.

The 33-year-old said she would not have another child until they got married and appeared to suggest abstinence was their best form of contraception.

"Not yet. Not until after we get married. My partner is very traditional," she told British newspaper The Times.

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"We can't ... I mean we're just ... waiting," she said.

Kerr, who has son Flynn with Orlando Bloom, has said she won't have another child until her and Spiegel are married. Photo / Getty
Kerr, who has son Flynn with Orlando Bloom, has said she won't have another child until her and Spiegel are married. Photo / Getty

The comments mark a sharp change from her previous interviews such as with British

GQ

in which she spoke about using sex as exercise and joining the mile-high club.

Kerr's latest collaboration on a 12-piece capsule collection will see proceeds go to the Royal Hospital for Women Foundation in NSW.

She said having ben a premature baby herself the cause is close to her heart. Her son Flynn, with actor Orlando Bloom, was also born premature and spent his first days in neonatal intensive care.

The LA-based model got engaged to Evan Spiegel in July after meeting him in 2014. The company behind Snapchat, known as Snap, is expected to list on the stockmarket shortly with a value estimated at US$25 billion.