Leah Messer Credit: Paul Archuleta/FilmMagic

As she gets ready for the New Year, Leah Messer is already starting a new chapter in her life. The West Virginia native, 23, has secretly been living with her new boyfriend, TR. Despite denying these claims, the pair are definitely roomies, sources confirm to Us Weekly.

“They were living together earlier this year,” a source tells Us. “Leah has never been without a man in her life. She usually goes immediately into another relationship after one ends.”

That was definitely true of Messer’s last two relationships, with ex-husbands Corey Simms and Jeremy Calvert. The MTV star wed Calvert in April 2012, exactly one year after she’d divorced Simms. She and Calvert finalized their divorce this past summer.

Ali and her daddy! #aligrace

A photo posted by Jeff Joetta Simms (@poppawjeff) on

The source also adds that Messer took her new man to Los Angeles with her this summer to tape the Teen Mom 2 reunion, despite flat-out denying to Simms that she was living with TR and that their twin daughters, Ali and Aleeah, 5, had been around him. But these days the bearded dad doesn’t seem to be focusing his energy on his ex. He and his wife, Miranda, welcomed their baby daughter, Remi, in November. 

So much fun having a baby around again. Love this little girl! #remi

A photo posted by Jeff Joetta Simms (@poppawjeff) on

“They’re all doing great,” a source close to Simms tells Us. “Remi is gaining weight and doing very well. Ali and Aleeah are thrilled with their little sister. They are excited about being big sisters to her.”

Addie and sissy play outside this evening

A photo posted by Jeremy Calvert (@jeremylcalvert505) on

In fact, proud grandpa Jeff Simms has shared several photos of the girls and their new baby sis on Instagram.

Aliannah read a book to her sister today. #aligrace

A photo posted by Jeff Joetta Simms (@poppawjeff) on

“Aliannah read a book to her sister today. #aligrace,” he captioned a cute shot in late November.

And though Messer insists that Corey is never around for their girls, Jeff’s Instagram page tells a different story. Corey’s dad has recently posted several shots of the twins in Corey’s truck and out to lunch with their dad at McDonald’s.

But Messer, who lost primary custody of Ali and Aleeah to Corey in October, still seems to resent her ex. On Wednesday, Dec. 9, she tweeted an article about Calvert coming to Ali’s winter chorus concert, writing, “Prime Example of Coparenting and doing the RIGHT thing for the little innocent hearts involved!!”

Corey and Ali at her favorite place to eat! #aligrace #mcdonalds

A photo posted by Jeff Joetta Simms (@poppawjeff) on

Messer has frequently said that she has no problems with Calvert, despite the fact that he has moved on after their painful divorce. But she continues to butt heads with Corey and Miranda.

For the time being, Messer is enjoying her now-limited time with her three girls, whom she recently called “my inspiration” on social media. 

Want stories like these delivered straight to your inbox? Sign up now for the Us Weekly newsletter!