PICS: Cute! Britney Spears' Sons Sean Preston, Jayden Get Active!


Brit's boys are getting so big!

And Britney Spears couldn't be any prouder of her sons, Jayden, 5, and Sean Preston, 6! The newly-engaged pop star, 30, showed off some in-action shots of her tots on Twitter this week.

On Tuesday, she uploaded a picture of Preston, her "little Hercules," flexing his muscles and "enjoying his gymnastics class!"

The next day, she tweeted a photo of Jayden "having some hair raising fun on the trampoline."

While the boys' biological father is Spears' ex-hubby Kevin Federline, her fiance Jason Trawick plays a huge role in Jayden and Sean Preston's lives. "Jason is just amazing with the boys," the multi-platinum singer raved to Us Weekly. "They look up to him so much -- they adore him. He's their hero."