Courteney Cox & Lisa Kudrow Reunite in the Name of Art

Lisa Kudrow and Courteney Cox

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Courteney Cox

The cast of Friends isn't reuniting on the small screen, but Courteney Cox and former costar, Lisa Kudrow, held a little reunion of their own on Thursday night.

Making their way to P.S. Arts' LA Modernism Show at the Baker Hangar in Santa Monica, Calif., the ladies shared a hug when Kudrow – who came with hubby Michel Stern – found Cox in the crowd, an onlooker tells PEOPLE.

The hug seemed "obviously genuine," the source says. "After talking for a few minutes, Lisa got really excited and tapped Courteney on the shoulder and said, 'Look, my sister's over there!' Then they walked over to see her sister, who it appeared Courteney was also very close with."

Although the two managed to make it a "low-key" outing, they fit in time to take a "few silly photo poses together" and sip on Ultimat vodka cocktails.