It has been reported that supermodel Heidi Klum and musician Tom Kaulitz secretly married in February after a two-month engagement.

US celebrity website People says it has confirmed TMZ reports that 45-year-old Klum and 29-year-old Kaulitz obtained a confidential marriage certificate earlier this year in California.

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Representatives for the couple did not comment.

Klum and Tokio Hotel's Kaulitz made their first public appearance as a couple in May 2018. 

She told her social media followers last December that she and Kaulitz were engaged. 

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Mother-of-four Klum was previously married to stylist Ric Pipino from 1997 to 2002, and to singer Seal from 2005 to 2014.