Britney Spears, 39, poses with sons Sean Preston, 15, and Jayden James, 14, talking about parenthood

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Britney Spears took to Instagram Monday posting a shot alongside her teen sons Jayden James and Sean Preston as she mused about parenthood.'It’s so crazy how time flies,' the 39-year-old singer said of sons Sean Preston, 15, and Jayden James, 14, as the three were posed in a sunny canyon area, which she photoshopped an alternative version of, with massive clouds.'My boys are so big now!!!!

I know … I know … it’s very hard for any mama especially a mama with boys seeing them grow up so fast!!!!' she said. Happy day:Britney Spears, 39, took to Instagram Monday posting a shot alongside her teen sons Sean Preston, 15, and Jayden James, 14, as she mused about parenthood'Talk about enough to make you go to your knees ...