United Kingdom, Sept. 12 -- Heidi Klum left her son Henry gobsmacked with his special 21st birthday gift.

The 53-year-old model and her 37-year-old husband, Tokio Hotel guitarist Tom Kaulitz, pulled out all out, splashing out on a red Ferrari F430 worth more than six figures, to celebrate his special day on Saturday (12.09.26).

In a video shared on Instagram, Henry appeared stunned as he walked out of the family home with his stepdad following behind, and saw his new flashy sports car waiting for him in the driveway.

As he caught a glimpse of the Ferrari, Henry exclaimed: "Oh my God! Jesus Christ. I don't even know what to say."

Recording the special moment, Heidi said: "I can't believe it is that time. You've been waiting for so many...