They fell out in 2010 when EastEnders star Cassidy wrote an article damning model McLean over the amount of weight she lost after giving birth.
However, today in the garden the pair exchanged warm words while they discussed tonight's impending eviction, which will seal the exit of either Georgia Salpa or Andrew Stone.
Cassidy insisted, "The three people I don't want to nominate are you, Denise [Welch] and Gareth [Thomas]," to which McLean replied: "Same."
Nicola later pondered: "Wonder who'll go at the eviction?" Natalie then admitted: "I hope Andrew goes."
Yesterday, Cassidy agreed with McLean's argument criticising Natasha Giggs's controversial affair with brother-in-law footballer Ryan Giggs.
Celebrity Big Brother's first eviction show of 2012 will air live from 9pm on Channel 5.
> Digital Spy readers want Andrew Stone evicted
> Michael Madsen quizzes Nicola McLean over Natasha Giggs Twitter spat