He explained that previous attempts to reach out to his sibling had failed but they've now FaceTimed since he left the villa.
The businessman said his colleague's upcoming operation will 'hopefully' be his last.
The model and dancer suffered third-degree burns in January after she caught fire when a TikTok 'life hack' video went horribly wrong.
The dancer and her boyfriend, Strictly's AJ Pritchard, were testing a TikTok trend when Abbie was engulfed in flames.
Walliams said he couldn't think of anything better than sitting in a tent with the 'Bake Off' judges eating cake all day.