Martin Kirsten and Heidi Klum. Picture: BuzzFoto/FilmMagic

Supermodel Heidi Klum is back on the market after reportedly splitting from her burly bodyguard boyfriend Martin Kirsten.

Reports have begun to circulate that the 40-year-old ended her one-year romance with Kirsten a few weeks ago.

The couple had initially hooked up shortly after the German-born beauty split form her husband of seven years, Seal, in January, 2012.

"Martin was there for her during a challenging time in her life and it was something she will always be grateful for," a source told People.com.

"Life is about timing. He was incredibly supportive and they were there for each other, but they're moving on now."

Klum - who has two children, Lou, four, Henry, eight, and Johan, seven from her marriage to Seal and a daughter, Leni, nine, from her relationship with former flame Flavio Briatore - has also cut professional ties with Kirsten.

The end of their personal and professional relationship comes even after Kirsten helped save her son Henry and her two nannies from a near-drowning incident after they were caught up in a rip in Hawaii early last year.

The mother-of-four has previously spoken of her affections for Kirsten and how he made her feel safe.

"He's been helping me for four years now, and he takes wonderful care of the kids," she previously said. "He plays with them, he protects them. I trust him."

The West Australian

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