"It’s so crazy how time flies..."

Britney Spears sons are all grown up and this is going to make you feel a little older than you felt before you read this. The 36 year old singer rarely posts pics with anyone in her family so it's not often we see her posing with her two sons. Yesterday she posted a picture with the boys who have grown up into young men. Britney is currently enjoying some family time with her two sons, Jayden, 14, and Sean Preston, 15. She posted a few pics on Instagram, the singer is in the middle of her two boys who are towering over her. She captioned the pics: "It's so crazy how time flies .... 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 wrote. "Talk about enough to make you go to your knees... GEEZ!!!! I’m extremely lucky because my two babies are such gentleman and so kind that I must have done something right!" Britney goes on to explain why she doesn't often post pictures of her sons, writing: "I haven’t posted pictures of them for some time cause they’re at the age where they want to express their own identities and I totally get it... But I went out of my way to make this cool edit and guess what... They’re finally letting me post it!" She goes on to say "now I don’t feel left out anymore and I’m gonna go celebrate... Oh shit I guess cool moms don’t do that... Ok I’ll just read a book instead!" The last time Britney mentioned her sons was back in September when she was wishing them a happy birthday. She captioned the pic: "My two lil men's birthdays are this week! You guys are getting older and so big and are waaay cooler than me!! I love you both to the moon and back, and I hope all of your bday wishes come true and more!"