Justin Theroux strolls with his dog… after wishing ex Jennifer Aniston a happy 52nd birthday

Justin Theroux used Instagram to pay tribute to his ex wife Jennifer Aniston in celebration of her 52nd birthday on Thursday.

And hours after posting, the 49-year-old actor was spotted strolling around New York City with his beloved rescue dog Kuma.

Theroux braved the snowy weather in a black windbreaker jacket that featured a drawing of a Pit Bull on the back of it.

They see me strolling: Justin Theroux was spotted strolling around New York City with his beloved rescue dog Kuma

He layered the jacket over a black hooded sweatshirt and threw on a pair of distressed denim jeans.

In order to trek through the snow, Theroux slipped on a pair of stylish combat boots.

Adding some extra warmth to his ensemble, the Mulholland Drive star donned a black beanie and a pair of leather gloves with red detailing.

In order to adhere with COVID-19 protocols, Justin kept his mouth and nose concealed with a face mask.

Responsible: In order to adhere with COVID-19 protocols, Justin kept his mouth and nose concealed with a face mask

 Responsible: In order to adhere with COVID-19 protocols, Justin kept his mouth and nose concealed with a face mask

Staying warm: Theroux braved the snowy weather in a black windbreaker jacket that featured a drawing of a Pit Bull on the back of it

Staying warm: Theroux braved the snowy weather in a black windbreaker jacket that featured a drawing of a Pit Bull on the back of it

Justin walked down the sidewalk and through various piles of snow with Kuma’s leash wrapped around his hand.

Kuma, who Theroux often shows off on his Instagram, looked adorable in a padded doggy jacket as he trotted next to his owner.

For his birthday tribute to Jennifer, Justin shared a glamorous snap of his former partner going up a spiral staircase with a mirrored wall and wrote: ‘[heart] you B!’   

All that sweet affection: Justin Theroux wished a happy 52nd birthday to his ex-wife Jennifer Aniston on Thursday

All that sweet affection: Justin Theroux wished a happy 52nd birthday to his ex-wife Jennifer Aniston on Thursday

It is not known why The Leftovers star often calls her by the nickname B as the letter is not in her initials – her middle name is Joanna.

The pair were married from 2015 until 2017 but managed to stay friendly after what Justin has previously called a ‘gentle separation.’

The Friends icon threw a glance over one shoulder as she climbed the stairs while modeling a long flowing overcoat.

They announced their split in February 2018 and a few months later Justin told the New York Times about how amicable the process had been.

The way they were: The pair were married from 2015 until 2017 but managed to stay friendly after what Justin has previously called a 'gentle separation'; pictured in 2015

The way they were: The pair were married from 2015 until 2017 but managed to stay friendly after what Justin has previously called a ‘gentle separation’; pictured in 2015

‘The good news is that was probably the most – I’m choosing my words really carefully – it was kind of the most gentle separation, in that there was no animosity.’ 

The Tropic Thunder writer added: ‘In a weird way, just sort of navigating the inevitable perception of it is the exhausting part.’

Justin, who is three years younger than Jennifer, married her in Bel-Air in 2015 and they broke up about two years later.

Justin and Jennifer began dating in 2011, having worked together on the film Wanderlust. He had carried on a 14-year relationship with costume designer Heidi Bivens that collapsed in 2011. 

At the time, E! News claimed that Heidi had been, according to a friend of hers, ‘”straight-up dumped,”‘ though the report qualified: ‘Not to say it’s Aniston’s fault, maybe the timing was just terrible?’

As seen in 2001: Last year the public saw how much Jennifer's relations have thawed with her first husband Brad Pitt who infamously left her for Angelina Jolie in 2005

As seen in 2001: Last year the public saw how much Jennifer’s relations have thawed with her first husband Brad Pitt who infamously left her for Angelina Jolie in 2005

‘Things were already over between him and Heidi before he got close to Jen,’ a source in Justin’s camp insisted to Page Six. 

Heidi’s mother Marilyn spoke to Radar Online in 2016, claiming that Justin initially tried to persuade Heidi he and Jennifer were not an item.

Marilyn said: ‘Heidi told me what Justin had told her, that something was going to be written about him and Jennifer, that something was going on between them and he wanted her to know that it was nothing, there was nothing to it.’

Ultimately, Heidi discovered the rumors were true, ‘And my sweet Heidi she calls me and says: “Oh mommy.” I was going through cancer at the time. It was a time that hurt our family.’ Marilyn recalled.

So sweet: Jennifer was seen having a friendly conversation backstage at last year's SAG Awards with her first husband Brad Pitt

So sweet: Jennifer was seen having a friendly conversation backstage at last year’s SAG Awards with her first husband Brad Pitt

Last year the public saw how much Jennifer’s relations have thawed with her first husband Brad Pitt who infamously left her for Angelina Jolie in 2005.

Brad and Jennifer both won acting trophies last January at the SAG Awards – where he made a joke onstage about his failed marriages.

He vamped sarcastically that it had been ‘difficult’ to play a ‘guy who gets high, takes his shirt off and doesn’t get on with his wife’ in Once Upon A Time In Hollywood. 

The camera then cut to the audience where his Jennifer clapped at the joke and wore an expression of wry recognition.

She and Brad were spotted having a friendly conversation backstage – and as she walked away she placed a hand on his chest and he briefly held onto her wrist.

What a moment: As she walked away from him after their talk, she placed a hand on his chest and he could be seen holding her wrist

What a moment: As she walked away from him after their talk, she placed a hand on his chest and he could be seen holding her wrist