Britney Spears's teenage sons Sean and Jayden look so grown-up in a brand new snap that was shared by a family friend on Instagram.

Sean Preston, 16, and Jayden James, 15, stay out of the spotlight but the new pic, posted by a friend of their dad Kevin Federline, reveals that the pair have shot up in height – and they're sporting the first signs of stubble too.

The brothers haven't often been seen on social media in recent years and pop superstar Britney herself has told her fans that her sons are very private.

Yet Kevin's friend Eddie Morales has now shared some pictures of himself posing with the boys, as he praised the former dancer for raising the two young men well.

The snaps see Sean wearing a plain black hoodie, dark jeans and as he showcases his mop of thick blonde hair, which is styled in a fluffy bob.

Jayden has taken after his dad with sleek brunette locks, choosing to grow them out past his ears.

Jayden also opted for a casual dark jumper with a white T-shirt underneath, but completed his look with a pair of bright tie-dyed yellow trousers.

Both teens grinned as they shared the happy moments with Eddie.

"During times of grief knowing u have #family really feels worth living…" Kevin's friend posted, clearly feeling reflective.

"Talk bout seeing my nephews when they were pods smaller than my hands now look at #life how beautiful gods work is … love you bro @federline4real. #unlikenoother, #trueGentleman, #Friends, and #brothers."

Eddie went on to say that his close bond with the TV personality will continue and they plan to support each other "till the wheels fall off".

Finishing his post with a pointed remark over how the world has viewed the Britney and Kevin relationship over the years, he added: "NOW THE WORLD WILL SEE HOW MUCH OF A GREAT #DAD HE HAS BEEN!"

Last month, Britney, who is engaged to actor Sam Asghari, posted about her sons and her special bond with them.

First using the quote "There is nothing stronger than the love between a mother and a son," she then continued: "My boys' birthdays were last week, and unfortunately they are growing up and want to do their own things….

"I have to ask their permission to post them because they are extremely independent little men."

She celebrated the boys' birthdays with a party at her home.

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