Ashton Kutcher and Demi Moore
and Ashton Kutcher
are amicable exes.
The pair, who announced their plans to divorce
in November, reunited at Kabbalah instructor Yehuda Berg's 40th birthday gathering on Thursday at the Intercontinental Hotel in L.A.'s Century City – but contrary to reports, the former couple aren't reuniting
"They were friendly," an insider tells PEOPLE of the interaction between the duo, who arrived separately. "Ashton got up at one point and grabbed coffee in a paper cup for Demi, and they smiled a few times during the program at each other. They seemed to get along and feel comfortable."
According to another source, friendly interaction is as far as things will go between the exes.
"The family is in a pretty good place right now, but Ashton and Demi won't go back to being what they were," the source says. "Ashton will always be a part of their lives, especially with regard to the girls and how close he is with them."
Of Moore, 49, who recently completed a stint in treatment
, the source says Kutcher, 34, "will always support" his ex, but "the relationship has evolved and will continue to. There are just too many issues to go back. It's about figuring out how to move forward into a new place."