There was a surprising guest at Away CEO Jen Rubio’s luxe birthday party – her estranged husband.

The socialite celebrated with an over-the-top bash in the Hamptons with a Met Gala-esque lineup up of Uptown fixtures — including her ex, billionaire tech entrepreneur Stewart Butterfield.

The pair split earlier this month after six years of marriage.

They released a statement at the time including the standard celebrity boilerplate about their “deep love and respect for one another” and saying they “are still a family.”

But from the Slack exec’s presence at the bash it seems that, for once, they might actually have meant it.

A source tells Page Six…

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