Britney Spears Posts Photo with Her Teenage Sons

Britney Spears got some quality time in with her teenage sons … and shared a rare photo of them all together as a memento.

Britney posted the pic Monday of her and her 2 boys — 15-year-old Sean Preston and 14-year-old Jayden — standing in an open field together … and she looks happy as can be.

She marveled at how big her kids are now and how time flies, saying … “it’s very hard for any mama especially a mama with boys seeing them grow up so fast !!!!”

Brit’s also very proud of her sons, adding … “I’m extremely lucky because my two babies are such gentleman and so kind that I must have done something right !!!!”

The singer says she hasn’t posted any photos of Sean Preston or Jayden in a while because — well, they’re teenagers — but they let her post this one … including an edited version with a more intense background.

As you know … Britney’s relationship with her sons — who she had with Kevin Federline — has been rocky at times, and Kevin has custody of them the majority of the time.