Credit: TMZ

Awkward family photo?

Charlie Sheen and ex-wife Brooke Mueller happily reunited over the weekend for a casual family portrait with Bob and Max, their adorable two-year-old twin sons.

The exes -- Sheen notoriously attacked her during a violent Christmas 2009 confrontation -- took the pic on the stairs of his Hollywood mansion on Sunday, they told TMZ.

Bob and Max clutched candy during the impromptu photo shoot. "Harmony is our goal," Sheen, 45, told TMZ of the reunion with Mueller, who is currently seeking treatment at a rehab center. "Sunday was a wonderful start."