Racing driver-turned-Dancing With The Stars champion Helio Castroneves has become a first-time dad -- his longtime girlfriend Adriana Henao has given birth to a baby girl.

Henao delivered little Mikaella on Monday afternoon in Atlanta, Ga., Entertainment Tonight confirms.

The tot was an early holiday surprise for the couple, who weren't expecting their new bundle until early January.

The 34-year-old race ace logged on to Twitter.com to share the news and a picture of his new happy family of three.

Upon announcing the pregnancy in October, the Brazilian said there were no immediate wedding plans, but admitted marriage will be the "natural next step."