jadenwillowtour.jpgsmiths030411_09-full.jpgMr. Paparazzi

Willow and Jaden Smith (along with their famous folks, Will and Jada) left their hotel in Birmingham today and headed to the stadium where they'll help Justin Bieber kick off his European tour.

Wearing a Gucci bag, tie-dye pants and bright red boots, Willow looked excited be performing in front of a sold-out crowd.

10-year-old Willow, who scored a huge hit with "Whip My Hair", is set to be the Biebs opening act. Jaden joined the superstar for "Never Say Never", and even though his appearance hasn't been announced, we can bet he'll be stepping out on the stage tonight!

Willow, who just released her second single, “21st Century Girl”, has said that she wants to be a HUGE star.

“I would like to be a very well-known artist," she said in a recent interview. "I would like to be as big as Lady Gaga. I would like to be bigger … I’d like to be a big rock star."

The Smiths were recently criticized by author Terry McMillan for "pimping" out their kids. The How Stella Got Her Groove Back author tweeted, "The Smith children already act like child stars. There’s an audacity in their appearance and behavior. we find it impossibly sad. It feels like a Smith children are being pimped and exploited. Or, they’re already inspired for fame. What about fourth grade?"