Fans believe Jennifer Aniston has reunited with her ex-boyfriend John Mayer.

John shared a video showing himself on the flood playing with two dogs, one of which, according to some fans, looked a lot like Jen’s four-legged pal, Lord Chesterfield.

“choo choo here comes new music,” John captioned the TikTok video.

He wrote in the video: “TikTok A new music… me chumming it up with dogs.”

Fan accounts and celebrity gossip accounts, such as @DeuxMoi, asked whether they were the same dog.

DeuxMoi, a gossip journalist, wrote on Instagram: “John Mayer and Jenny An. Is that Jennifer Aniston’s dog in JM’s new TikTok announcing his new music. A doggy playdate perhaps.”

Fans were left convinced John shared a video on TikTok with Jen’s dog (Image: TIKTOK)

Lord Chesterfield, who has joined Jennifer Aniston’s family with Clyde and Sophie, is the latest cute addition to Jennifer’s pack.

DeuxMoi also pointed out that Jennifer’s dog, Lord Chesterfield, was wearing the same collar as the puppy in John’s TikTok video in one of her photographs.

(Image: TIKTOK)

Fans flocked to the comments section to compare notes on whether or not Jen’s dog was involved.

“NÃO GENTE CALMA ESPERA UM MINUTO,” one Twitter user commented, which the platform translates as “DON’T CALM PEOPLE WAIT A MINUTE.”

Another admirer said, “OMG are you back with Jen?”

“Awww that dog looked like Jennifer’s!” wrote another.

Others, though, disagreed, writing: “They’re not the same dog. Look at the face, ears and the tail.”

“Nope that’s not the same dog guys calm down,” someone else replied.

Sorry to disappoint any fans hoping for a reunion between these two, who dated from 2008 to 2009 after meeting at an Oscars party.

According to US Weekly, John composed the song Shadowy Days after they split up to help him put the relationship behind him.

Jen recently spoke up about where the two are now following their divorce, telling Vogue: “There was no malicious intent. I deeply, deeply care about him; we talk, we adore one another. And that’s where it is.”