She might be a mum-of-four, but stunning supermodel Heidi Klum has admitted she is considering motherhood for the fifth time.

As her kids are growing up, 49-year-old Heidi is considering making husband Tom Kaulitz a father for the first time.

Heidi married her rock star musician husband, 33, in 2019, making him a stepfather to her brood of four children.

The model already has four children from relationships with her ex-partner Flavio Briatore and ex-husband Seal. She is mum to daughter Leni, 18, son Henry,17, son Johan, 16, and her youngest daughter Lou, who is 13.

49 year old model Heidi opened up on hopes to become a mum again
49 year old model Heidi opened up on hopes to become a mum again
Heidi Klum and Tom Kaulitz
Heidi Klum and Tom Kaulitz married in 2019

Speaking to the US Sun, Heidi revealed: "I mean wanting it and it actually being possible are always two different things. The big 50 is just around the corner. And things get harder when you get older.

"But would I want it? Sometimes I think yes."

However, Heidi is aware of the difficulties as she shared: "When the clock ticks when you get older it is not as easy as it was when you are younger."

The stunning mum of four had also come under fire recently after posing in an underwear shoot with her lookalike daughter Leni.

The pair took part in a lingerie shoot for the Italian brand Intimissimi, with some branding the photos as 'uncomfortable'.

UK TV presenter Ulrika Jonsson slammed the shoot, as she said: "Heidi Klum isn’t the first and she won’t be the last as she makes many feel slightly uneasy by posing in undies with her equally scantily clad 18-year-old Leni.

Heidi Klum and Tom Kaulitz
Tom is stepfather to Heidi's four kids from previous relationships
Heidi Klum and Tom Kaulitz are considering parenthood
Heidi Klum and Tom Kaulitz are considering parenthood

"Heidi joins a string of model and celebrity mums who have made the strategic decision to exhibit their girls – Cindy Crawford did it with Kaia; the delectable Kate Moss has posed with her model daughter, Lila; Yolanda Hadid loves showing off Gigi and Bella and even Gwynnie has been known to flaunt her beloved Apple."

However, confident Heidi has brushed off criticism of the mother-daughter lingerie shoot. In an interview, she said: "I see how comfortable she is around me. There are no hang ups about her body or us. We are, like, in our underwear dancing around the studio – she could not care less."

She added: "It makes me proud. I feel like she is really grounded and she feels confident in herself."