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Britney’s son Jayden is growing up so fast — but it looks like his hair is growing even faster!

Newly-engaged pop star Britney Spears shared an adorable pic of her son Jayden horsing around on the trampoline. Check out that crazy ‘do! “Jayden is having some hair-raising fun on the trampoline!” she wrote.

The pic shows her five-year-old with hair standing on end. Earlier, she had posted a pic of his big bro Sean Preston getting active at a gymnastics class.

“‘My little Hercules’ enjoying his gymnastics class,” she wrote.

The boys are getting SO big!

More Britney:

1. NYC’s Biggest Baby Names In 2011 — Thanks To Kristen Stewart & Britney Spears
2. Britney Spears Didn’t Have To Ask Her Legal Guardian’s Permisson To Marry, Says Expert
3. Britney Spears’ Engagement Ring Cost $200,000, Experts Say