Fin Affleck's close relationship with JLo's child Emme Maribel Munniz, 16 - who began using gender-neutral pronouns two years ago

Jennifer Garner and Ben Affleck's 15-year-old, formerly known as Seraphina Rose, officially debuted their new name Fin as they made an emotional appearance at a memorial service for their grandfather - and one special friend was sure to be by their side for support.

The teenager has developed an increasingly close bond with their step-sibling Emme Maribel Muniz, Jennifer Lopez's 16-year-old, who uses gender neutral pronouns.

The pair have often been spotted spending time out together - sometimes even holding hands - strolling around Los Angeles.

They have enjoyed each other's company since even before JLo tied the knot with Ben in 2022 - and the year prior, were all smiles during a Disney World outing with the 13 Going on 30 actress. 

Not only are they close in age, but Emme and Fin have long been know for their similarly experimental fashions and hairstyles.

The teenager (left)  has developed an increasingly close bond with their step-sibling Emme Maribel Muniz (right), Jennifer Lopez 's 16-year-old, who uses gender neutral pronouns. Pictured in 2022

Speaking on the TODAY show last year, Lopez - who is also a mother to Emme's twin Max - opened up about the move to having all their children under the same roof.

Fin also has a sister, Violet, 18, and brother, Samuel, 15.  

'It's been, like, a really kind of emotional transition, but at the same time all your dreams coming true,' she said.

'It's just been a phenomenal year. Like, my best year I think since my kids were born.'

In December, a source also told ET that the blended family enjoys spending time together thanks to the children's close bond.

'Ben and Jen's kids get along super well, and everything has been easy and seamless on that front, which has been really nice for them,' they told the outlet.

'Ben and Jen Garner are also in a good place. They have a mutual understanding that their children come first and are committed to that.' 

Garner and Affleck split in 2015 and finalized their divorce in 2018, but maintain a friendly relationship. 

Not only are they close in age, but Emme and Fin have long been know for their similarly experimental fashions and hairstyles. Both pictured in 2021

In December, a source also told ET that the blended family enjoys spending time together thanks to the children's close bond. Emme  and Fin in 2022

Fans on social media have also for years remarked at Emme and Fin's 'inseparable' friendship, dubbing them 'BFFs'. 

It is understood that the pals also attend the same school, with Fin sure to have helped Emme adjust after their move to Los Angeles from Miami, according to Hola!.

Lopez first publicly introduced Emme's pronouns to a crowd at the LA Dodgers Foundation's Blue Diamond Gala where they both performed in June 2022.

'[The last time] we performed together was in a big stadium like this, and I ask them to sing with me all the time but they won't,' the star said onstage.

'So, this is a very special occasion, because they're very, very busy and booked and pricey.

'They cost me when they come out, but they're worth every single penny because they're my favorite duet partner of all time.'

Last weekend, Fin debuted their new name before reading a bible verse to the congregation at Christ Church United Methodist in Charleston, West Virginia on Saturday.

The two were pictured together on a Los Angeles street with Affleck on February 12, with Fin sporting an eye-catching temporary pink hair dye 

Garner and Affleck split in 2015 and finalized their divorce in 2018, but maintain a friendly relationship. Ben and Fin in 2022

The teen has been pictured with their new short cropped hair as early as February this year, but the funeral was the first time the top actors' child introduced themselves in public with a new name.

The memorial service, streamed live on Facebook, was for Garner's father William Jack Garner, who died a week earlier age 85.

Following William's other grandchildren, Fin introduced themselves at the church lectern saying: 'Hello my name is Fin Affleck,' then read Chapter 16, Verse 8 from the Book of Proverbs: 'Better is a little with righteousness, than a large income with injustice.'

The two were pictured together on a Los Angeles street with Affleck on February 12, with Fin sporting an eye-catching temporary pink hair dye.

The first hints of their new name came a few days earlier when Fin was pictured hugging their mother goodbye at their school bus stop in Brentwood, LA. In the photo the name 'Fin' can be seen embroidered on their backpack.

Last weekend, Fin debuted their new name before reading a bible verse to the congregation at Christ Church United Methodist in Charleston, West Virginia on Saturday

The teen has had a boyish haircut for years and has regularly been pictured in more masculine clothing.

The 15-year-old is just one of several celebrity kids who are finding their identities.

Actress Jamie Lee Curtis' daughter Ruby came out as transgender in 2021.

'I'm in support of my daughter Ruby. I'm having them be a they/them,' Curtis said on the Today show last year.

'I'm going to just call them them. They/them, and they are doing great, they're settling in. I just — in my life, I never saw it in a million years that I'd have [these] couple days, and I'm very moved by the whole thing.'

Former Miami Heat NBA player Dwyane Wade also told the Ellen DeGeneres Show in February 2020 that he had taken up new 'roles and responsibilities' since his daughter Zaya came out as transgender.

Emme's friendship with Fin has for years been loved by fans, who have dubbed them 'inseparable'

Actress Jamie Lee Curtis' daughter Ruby (left) came out as transgender in 2021. Pictured with her mother and sister in 2022

Former Miami Heat NBA player Dwyane Wade also told the Ellen DeGeneres Show in February 2020 that he had taken up new 'roles and responsibilities' since his daughter Zaya (left) came out as transgender. The family pictured in 2022

Meanwhile in 2019, actress Charlize Theron revealed that her eldest daughter Jackson, who she adopted as a baby, is transgender. The mother and daughter pictured in September

He said he and wife Gabrielle Union try to 'figure out as much information as we can to make sure that we give our child the best opportunity to be her best self'.

'We are proud parents of a child in the LGBTQ+ community, and we're proud allies as well,' he added.

Meanwhile in 2019, actress Charlize Theron revealed that her eldest daughter Jackson, who she adopted as a baby, is transgender.

'Yes, I thought she was a boy, too,' Charlize told the Daily Mail. 'Until she looked at me when she was three years old and said: "I am not a boy!"

'So there you go! I have two beautiful daughters who, just like any parent, I want to protect and I want to see thrive.

Evolving: Angelina told Vanity Fair in 2011: 'She wants to be a boy. So we had to cut her hair. She likes to wear boys' everything. She thinks she's one of the brothers' (Shiloh pictured in 2014)

Offspring: Sigourney said her child Char (pictured in February 2020), who is non-binary and uses they/them pronouns, isn't sure about having kids with the 'world being the way it is'

'They were born who they are and exactly where in the world both of them get to find themselves as they grow up, and who they want to be, is not for me to decide.

'My job as a parent is to celebrate them and to love them and to make sure that they have everything they need in order to be what they want to be.

'And I will do everything in my power for my kids to have that right and to be protected within that.'

Sigourney Weaver also revealed in December 2022 that her and husband Jim Simpson's 34-year-old child identifies as nonbinary.

'They are nonbinary,' she told the Sunday Times of her child Char.

'They teach at Columbia, digital storytelling, bots, misinformation, they are someone who is excited about AI and not frightened about it.

There has also previously been speculation that Angelina Jolie and Brad Pitt's daughter Shiloh, 17, was transitioning genders after her parents' made comments about her gender identity.

There has previously been speculation that Angelina Jolie and Brad Pitt's daughter Shiloh, 17, was transitioning genders after her parents' made comments about her gender identity.