updated 05/30/2012 AT 2:15 PM ET
•originally published 05/30/2012 AT 3:00 PM ET
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.”