Rob quickly responded, writing in a comment beneath the post: 'I adore you.'
'Just think of the eyes on those children,' he wrote in a subsequent comment, adding a laughing/crying emoji.
Cosy: In the first image, Rob, 31, places a kiss on Ruby's cheek while resting one arm around her shoulder, while the second image (above) shows the pair hugging
Affectionate: Rob commented beneath the post: 'I adore you.' He then added: 'Just think of the eyes on those children'
Ruby also posted several cryptic Instagram Stories, including a picture of her heavily tattooed hand resting on top of an another person's hand.