Britney Spears and her boys are hell on wheels!

To celebrate sons Jayden James (above) and Sean Preston's birthdays, the pop star took the two of them ATV racing -- and even got behind the handlebars.

"My little future motor crosser and I ripping up the track....At 5 MPH! Yee haw," Spears wrote on Facebook along with a photo of her revving up with JJ.

In another photo, both sons are posed in their racing gear, looking pretty damn adorable and almost like twins. See that in the gallery above.

The two are only one year apart in age. Sean Preston was born September 14, 2005 while Britney and Kevin Federline welcomed Jayden on September 12, 2006.

Britney has been sharing a lot of family photos lately with her fans -- check out even more personal pics in the gallery!

Spears says Sean Preston might pop up on stage during her new Las Vegas show (much to K-Fed's disapproval). How cute would that be?!

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