Teen Mom 2 star Leah Messer is back together with her ex-husband Jeremy Calvert, multiple sources reveal to In Touch.

“They really missed each other,” an insider says of the pair who finalized their divorce in June following months of reports that both had been unfaithful. “They recently started hanging out again an awful lot, and they ended up getting really close.”

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So close Jeremy agreed to accompany Leah to her daughter Ali’s choir concert in early December.

“It was clear that they’re back on — they were acting like a happy family,” says the insider, adding that everyone was excited to see the two — who are parents to daughter Adalynn, 2 — together again.

“Even Corey [Simms, Leah’s other ex-husband and father to twins Ali and Aleeah, 6] seemed to be cool with the fact that Jeremy is back in her life.”

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Still, friends are urging Leah to take things slowly — especially since she just split from her trainer boyfriend, Theodore “T.R.” Dues.

“Leah is known to make impulsive decisions,” the insider explains, adding that she and Jeremy have a lot of issues to work through before they can even consider walking down the aisle again. “But everyone is crossing their fingers that they can make it work this time.”

For more on this and all your favorite Teen Mom cast members, pickup the latest issue of In Touch, on newsstands now!