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They are growing up so fast!

Britney Spears' youngest son Jayden turned 7 on September 12, and the pop princess decided to treat him and his older brother Preston to a dirt biking session to celebrate!

"My little future motor crosser and I ripping up the track... At 5 MPH! Yee haw!" she captioned a snapshot of the pair.

She's not exactly known for her driving skills, so maybe it was a good thing she let her son be in charge!

The "Work B*tch" singer also shared a picture of her children posing in moto outfits in front of a yellow birthday cake.

Although rumors are swirling that ticket sales for her upcoming Las Vegas show are less than impressive, her manager recently shot down the reports.

"This is the best-selling show in the history of Vegas," he told UK E! Online.

Brit Brit seems so at peace these days!