Fellow judge John Torode warns Theakston after he kisses Wallace's head, joking: "Listen, it's our bromance not yours. Don't you start getting cuddly with him, I'll get jealous."
Watch the Celebrity MasterChef clip below:
Neighbours star Anne Charleston, Javine Hylton and Stephen Parry are among the contestants competing with Theakston in tonight's show.
Previous winners of Celebrity MasterChef have included Matt Dawson, Phil Vickery, Jayne Middlemiss and Lisa Faulkner.
Celebrity MasterChef starts at 6.30pm tonight (August 13) on BBC Two.
Celebrity MasterChef - Meet the contestants:
Copyright: BBC Shine TV/Emilie Fjola Sandy