Heidi and boyfriend Tom are officially engaged! (Photo by Dave Benett/amfAR/Dave Benett/WireImage for amfAR)

Heidi Klum is engaged to be married, four years after divorcing musician husband Seal.

The 45-year-old revealed a surprise proposal from rocker boyfriend Tom Kaulitz, 29, on Christmas Eve sharing no further details than an excited, I said yes!

Supermodel Heidi, who went public with beau Tom in May, held up a huge coloured ring in an elated black and white photo liked by over 500k followers including famous pals Mel B, Gwen Stefani and Rita Ora.

Tom and Heidi spent Christmas Eve Eve at Disneys California Adventure with her youngest children Henry, 13, Johan, 12, Lou, nine.

The Americas Got Talent judge first got tongues wagging about her new relationship with the Tokio Hotel guitarist back in March.

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They were spotted sharing a kiss outside filming for AGT in California and confirmed the romance that May when they made their red carpet debut at Cannes Film Festival.

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Heidi split from long-term boyfriend Vito Schnabel, 31, last September after three years together.

It was her first long-term relationship since her seven-year marriage to Seal ended in 2012 but the divorce wasnt finalised until 2014.

The German model was previously married to Australian stylist Ric Pipino in 1997 for five years and has a 14-year-old daughter Leni with Italian businessman Flavio Briatore.

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