Lachy and Emma's pub appearance was part of the purple Wiggles side project with fellow bandmate Anthony Field, a folk band called The Unusual Commoners.
The outing comes after Lachlan and Emma took to the stage for young children at St Mary's Rugby League Club in Sydney on Sunday.
At the time, the Daily Telegraph reported the dynamic between the pair was 'tense' and 'awkward.'
Their body language during the performance was supposedly 'a little flat', the publication reported, and at one point Lachlan offered his hand to his ex, which she 'refused to accept.'
It remains unclear if this was an arranged part of the performance, a mistake in the choreography or a possible sign of tension.
At the time of their split announcement, the couple stated they would remain 'good friends.'
'We love and adore performing as Emma and Lachy in The Wiggles and having the privilege of celebrating this happiness with extraordinary families around the world.
'Please know that we are stronger than ever and we can't wait to see you at a show soon.'